Per the same website..."There are total number of 8 mosques at Ataturk Airport; 2 at the check-in area, 2 in transit area of the International Terminal and 2 at the arrivals floor, 2 in departure gates area of the Domestic Terminal; all open for service 24 hours."
Ofakhtar
Per http://www.ataturkairport.com/en-EN/airportguide/Pages/Mosques.aspx