The Subh prayer, also known as the Fajr prayer, contains 2 obligatory ra'kahs.
A ra'kah is a unit of prayer that consists of a combination of physical movements, recitation of verses from the Quran, and personal supplication to God. In Islam, the prayers are performed five times a day, and each prayer has a specific number of ra'kahs. The Subh prayer is performed before sunrise and consists of two ra'kahs.