Answer:
Messenger of God
Step-by-step explanation:
A prophet is the combination of a person who is very wise, who has some sort of clarividence about the future (or who can predict the future), and who is given that wisdom and that clarividence by a divine power, in other words, a God.
Muhammad was a prohet because he was given knowledge by God and by other divine beings like the archangel San Gabriel. He led the Arabian people to conversion into Islam, and inspired his followers to conquer the Middle East and North Africa in only a few decades, places where they spread Islam.