Fatto generale: 6245 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 6245 is the smallest number whose square contains 4 consecutive internal 0's.
Trivia: 6245 is a boring number.
Data storica: February 4th is the day in 1820 that the Chilean Navy under the command of Lord Cochrane completes the 2 day long Capture of Valdivia with just 300 men and 2 ships.