Simple proof of Mohammed being a prophet

If we compare the life of Mohammad (peace be upon him) before his mission as a prophet and his life after he began his mission as a prophet, we will conclude that it is beyond reason to think that Mohammad (peace be upon him) was a false prophet, who claimed prophethood to attain material gains, greatness, glory, or power.

n  Sahl Ibn Sa�ad, one of Muhammad�s companions, said, �The Prophet of God did not see bread made from fine flour from the time God sent him (as a prophet) until he died.�

n  Aa�isha, Muhammad�s wife, said, �The mattress of the Prophet, on which he slept, was made of leather stuffed with the fiber of the date-palm tree.�

n  Amr Ibn Al-Hareth, one of Muhammad�s companions, said that when the Prophet  died, he left neither money nor anything else except his white riding mule, his arms, and a piece of land which he left to charity.

Despite his responsibilities as a prophet, a teacher, a statesman, and a judge, Muhammad used to milk his goat, mend his clothes, repair his shoes, help with the household work, and visit poor people when they got sick. He also helped his companions in digging a trench by moving sand with them. His life was an amazing model of simplicity and humbleness.

An envoy of the pagan leaders, Otba, came to him saying, �...If you want money, we will collect enough money for you so that you will be the richest one of us.  If you want leadership, we will take you as our leader and never decide on any matter without your approval.  If you want a kingdom, we will crown you king over us...�  Only one concession was required from Muhammad in return for that, to give up calling people to Islam and worshipping God alone without any partner.  Wouldn�t this offer be tempting to one pursuing worldly benefit?  Was Muhammad hesitant when the offer was made?  Did he turn it down as a bargaining strategy leaving the door open for a better offer? 

What did he say? This is what every man wants. Money, kindgom, women, and glory! So did he accept?

^{{I swear by the name of God, O Uncle!, that if they place the sun in my right-hand and the moon in my left-hand in return for giving up this matter (calling people to Islam), I will never desist until either God makes it triumph or I perish defending it.}}

(Al-Serah Al-Nabaweyyah, Ibn Hesham, vol. 1, pp. 265-266.)

After this, he was starved for three years, him and his companions. At some point, all they had to eat were leaves and what would be snuck by sympathizers for them. He was almost killed nine times. Any false prophet, after one assasination attempt would at least shift his perspective and become less determined. Mohammed continued in his path and did not compromize Islam. Why would any fake prophet do such a thing? If any person, politician etc, is almost assasinated, they would change there perspective but this great man continues, so determined that he could melt a rock with his determination. How is this, unless it is that it is a divine creator supporting him and who have sent him.

Source: http://www.islam-guide.com/frm-ch1-6.htm