Answer: He is Muhammad (may Allah’s peace and blessings be upon him).

Allah Almighty says: {Muhammad is not the father of any of your men, but he is the Messenger of Allah and the seal of the prophets...} [Surat al-Ahzāb: 40] Moreover, the Prophet (may Allah’s peace and blessings be upon him) said: "I am the seal of the prophets, and there is no prophet after me." [Narrated by Abu Dāwūd, At-Tirmidhi, and others]