Is the eclipse prayer valid if I prayed two rak'ahs and two prostrations, being ignorant that it consists of four rak'ahs and four prostrations?

The eclipse prayer is valid. Most scholars consider it legislated for the moon, and Ibn Abbas performed it, and this was the view of Ata, Al-Hasan, Al-Nakha'i, Al-Shafi'i, and Ishaq. Malik and Abu Hanifa said that people should pray individually for a lunar eclipse, two rak'ahs at a time, and not pray it in congregation.