He is the final Prophet of mankind, the seal of the Prophets and Messengers. He renewed monetheism and removed paganism, he taught us how to live and be in the world and yet be with God in our hearts.
Here are some examples of his Miracles, some scholars name the amount as much as three thousand. I'll try to mention some here.
He had water pour form his hands enough for about 1,000 people to perform ablution, to drink and their animals to drink.
He was told that they wouldn't believe unless the moon split into two. He raised his hands and the moon split in two, there is a narration that a king in India saw it and became Muslim after hearing the news of a new religion.
Once a man came with a lizard in his hand and said I wont believe until this lizard believes. The Prophet (peace and blessings be upon) asked the lizard, it said, "I testify there is only one God and that you are his messenger."
Another time, some rocks could be heard praising God in his hand.
Once someone told him he wouldn't believe unless he saw a miracle. The Prophet (peace and blessings upon him) called a tree, which uprooted itself and came to the Prophet.
Many times, food would be multiplied when he was there
The greatest miracle is the Quran which is in the same language as its revelation and is preserved from all harm.
His guardian Abu Talib noticed that when Muhammad would eat first then the food would be enough for the rest of his family. They were poor, Abu Talib would make Muhammad (peace and blessings be upon him) start first. If they didn’t then the food would not suffice them.
He one went to a companions house, who cooked a small lamb and told him not to look in the pot and keep dishing it out. He did so about 500 people where fed, with the lamb as it was when it was cooked.
Once they had little food, so they gathered their dates and ate from them and the number did not decease.
He used to talk to the Muslim whilst leaning on a tree, when a Muslim woman built him a platform to stand on. The tree began to cry like a baby and he had to hug it to stop, to the companions, it sounded like a baby being comforted.
He predicted future events like the fall of Constantinople to the Muslims in 1492.