"Say: We believe in Allah and in that which has been sent to us and in that which was sent to Ibrahim, and Ismail and Ishaq and Ya'qub, and the tribes and that which was given to Moosa and Isa and that which was given to the Prophets form their Lord. We do not differentiate between any of them, and we submit to Allah. And so, if they believe in that which you believe, they have achieved guidance, but if they turn away, they are surely in rebellion. Allah will suffice you against them and He is the all-hearing, the all-knowing." [Soorah al-Baqarah (2): 136-137]
"The Prophet has believed in that which is sent to him from his Lord as have the believers. All of them believe in Allah, His angels, His books and His Messengers. We do not differentiate between any of His messengers, and they say: "We hear and we obey. (We seek)Your forgiveness, our Lord to You is the return (of all). Allah does not burden any soul beyond his scope. He gets reward for that (good) which he has earned, and he is punished for that (evil) which he has earned." [Soorah Baqarah (2): 285-6]
"This is a book in which there is no doubt, a guidance for those who are pious. Those who believe in the unseen, establish prayer, and spend out of what We have provided for them. Those who believe in that which was sent down to you and that which was sent down to those before you, and certainly of faith in the existence of the Hereafter. Such are on a true guidance from their Lord, and such are the successful." [Soorah al-Baqarah (2): 1-5]
Thus, a necessary component of faith (eeman) is to believe that Muhammad (Peace and blessings of Allah be upon him) is the seal of the prophets, and there is no prophet after him, and that Allah sent him to all of the two possessors of free will: humans and jinns.