Do the hadiths regarding the virtue of praying in Al-Aqsa Mosque — that it is equivalent to 500 or 1000 prayers — include individual prayer, or are they restricted to obligatory congregational prayers?

Prayer in Al-Aqsa Mosque is equivalent to five hundred prayers. This includes obligatory and supererogatory prayers, congregational and individual prayers, because the word "prayer" in the noble Hadith is general.