What are the virtues of Fajr prayer and the reward for it? Are the supererogatory prayers (Nawafil) the same as the regular Sunnah prayers (Sunan Rawatib), or do they differ? And what is the number of Rak'ahs for the supererogatory prayers?

A Muslim is required to observe all five prayers. The Fajr prayer is considered the middle prayer, according to some Companions. There are texts that indicate the greatness and virtue of the Fajr prayer. Whoever prays the two cool prayers (Fajr and Asr) will enter Paradise, and it is one of the heaviest prayers for the hypocrites.