Hello and thank you for the question,
yes, prophet Muhammad was prophesied in the old and the new testament.
You know that the Messiah's spoken language was Aramaic.
watch a scene from the " Passion of the Christ" movie, where Muhammad is mentioned ........watch this :
http://www.youtube.com/watch?v=_c4Sj_GRZ_o&feature=related
First, it is essential to note that Quoting the Bible prophecies does not entail that Muslims accept the present day Bible in its entirety as God’s revelation.
John 14:16 “And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever.” (American Standard Version)
In this verse, Jesus promises that another “Comforter” will appear, and thus, we must discuss some issues concerning this “Comforter.”
Was the comforter or the helper; the holly spirit :
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The Greek word paravklhtoß, ho parakletos, has been translated as ‘Comforter.’ Parakletos more precisely means ‘one who pleads another’s cause, an intercessor.’ The ho parakletos is a person in the Greek language, not an incorporeal entity.
John 14:26 is the only verse of the Bible which associates the Parakletos with the Holy Spirit. But the “ancient manuscripts” are not in agreement that the “Parakletos” is the ‘Holy Spirit.’ For instance, the famous Codex Syriacus, written around the fifth century C.E., and discovered in 1812 on Mount Sinai, the text of 14:26 reads; “Paraclete, the Spirit”; and not “Paraclete, the Holy Spirit.”
Why is it important? It is significant because in biblical language a “spirit,” simply means “a prophet.”
“Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.
When we continue reading beyond chapter 14:16 and chapter 16:7, we find that Jesus predicts the specific details of the arrival and identity of the parakletos. Therefore, according to the context of John 14 & 16 we discover the following facts.
1. Jesus said the parakletos is a human being:
John 16:13 “He will speak.”
John 16:7 “…for if I go not away, the Comforter will not come unto you.”
It is impossible that the Comforter be the “Holy Ghost” because the Holy Ghost was present long before Jesus and during his ministry.
John 16:13 Jesus referred to the paraclete as ‘he’ and not ‘it’ seven times, no other verse in the Bible contains seven masculine pronouns. Therefore, paraclete is a person, not a ghost.
Jesus is called a parakletos:
“And if any man sin, we have an advocate (parakletos) with the Father, Jesus Christ the righteous.” (1 John 2:1)
Here we see that parakletos is a physical and human intercessor.
Finally, it is worthy of saying that the Prophecy of another prophet to come after Jesus’ departure was not that hidden, yet; due to distortions, occurred mainly during the translation of the original text, which in turn was wrote hundreds of years after the departure of Jesus, by many men, it is like a golden coin found covered with sand, so you have to clear the sand to reveal its genuine, shiny and orginal identity.
How could Muslims or Christians be aware of this distortions, if it was not god’s revelation ?? the truth has been revealed in god’s last revelation to all mankind, (not only to the Israelites ) through the glorious Qura’an.
Updates
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Son of God, son of David, or son of Man? Jesus is identified as “son of David” fourteen times in the New Testament, starting with the very first verse (Matthew 1:1). The Gospel of Luke documents forty-one generations between Jesus and David, while Matthew lists twenty-six. Jesus, a distant descendant, can only wear the “son of David” title metaphorically. But how then should we understand the title, “son of God?”
And if Jesus Christ has exclusive rights to the term, why does the Bible record, “...for I (God) am a father to Israel, and Ephraim (i.e. Israel) is my firstborn” (Jeremiah 31:9) and, “...Israel is My son, even my firstborn” (Exodus 4:22)? Taken in the context of Romans 8:14, which reads, “For as many as are led by the Spirit of God, they are the sons of God,” many scholars conclude that “Son of God” is metaphorical and, as with christos, doesn’t imply exclusivity. After all, The Oxford Dictionary of the Jewish Religion confirms that in Jewish idiom “Son of God” is clearly metaphorical. To quote, “Son of God, term occasionally found in Jewish literature, biblical and post-biblical, but nowhere implying physical descent from the Godhead.”
Another matter
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When Isa (jesus) (pbuh) will return, then he will be sent to earth for a specific task assigned to him by god (Allah), moreover, Jesus was sent before, so how on earth do you calculate his second coming as a new prophet since he is the same person(pbuh)??
This subject is not written in Qur'an, but rather in sunna (sayings of the prophet Muhammad (pbuh), so you can search this matter by yourself, as this answer would be longer than it's already too long.
Hence, always there is not any contradiction in the noble Qur'an, yet there are always some who are not fully aware of its texts.
Djmantix
Muslims believe in Muhammad as a prophet because the Qur'an was sent to all mankind through him(pbuh).
We believe in Muses and Isa, also because it is written in Qur'an that we must believe in all prophets of god.
We have in our hand today the same book revealed to Muhammad (pbuh) without even any difference in one letter's pronunciation, so this noble Qur'an we sure it is Allah's divine’s words.
We have every logical reason to believe in Qur'an simply because it stands as a constant miracle, till our present day
Can you today show us the miracles of Isa -Jesus ?? you can't
So it's my turn to ask, how do Christians know that Jesus said he is god or son of god ??
Is it because Paul said so ?
Paul who has never met Isa (pbuh) once in his lifetime, and was the first to teach (the begotten son) doctrine, and what was his source ? dreams which he called them revelations !! honestly guys are you serious ?