How many times did the Messenger of Allah (peace and blessings be upon him) perform Umrah?

The Prophet, peace and blessings be upon him, performed four 'Umrahs (minor pilgrimages), all of which were in the month of Dhul-Qa'dah, except for the 'Umrah that was combined with his Hajj (major pilgrimage): 1. The 'Umrah of Hudaybiyyah in Dhul-Qa'dah in the sixth year of Hijrah. 2. The 'Umrah of al-Qada' in the following year. 3. His 'Umrah which he combined with his Hajj. 4. His 'Umrah from al-Ji'ranah after the Battle of Hunayn.

The Prophet, peace and blessings be upon him, did this in Dhul-Qa'dah due to the virtue of this month, and in defiance of what the people of pre-Islamic ignorance (Jahiliyyah) used to do by prohibiting 'Umrah during it.