Fait général: 6245 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 6245 is the smallest number whose square contains 4 consecutive internal 0's.
Culture générale: 6245 is an unremarkable number.
Date historique: February 4th is the day in 1977 that a Chicago Transit Authority elevated train rear-ends another and derails, killing 11 and injuring 180, the worst accident in the agency's history.