Fait mathématique: 2245 is the number of ways to tile a 8×4 rectangle with 2×1 rectangles.
Culture générale: 2245 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: February 22nd is the day in 1957 that Ngo Dinh Diem of South Vietnam survives a communist shooting assassination attempt in Ban Me Thuot.