Fait mathématique: 4225 is the smallest number that can be written as the sum of two squares in 12 ways.
Culture générale: 4225 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: July 26th is the day in 1953 that Fidel Castro leads an unsuccessful attack on the Moncada Barracks, thus beginning the Cuban Revolution.