Fatto generale: 6297 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 6297 is a value of n for which n and 5n together use each digit 1-9 exactly once.
Trivia: 6297 is an uninteresting number.
Data storica: March 28th is the day in 845 that Paris is sacked by Viking raiders, probably under Ragnar Lodbrok, who collects a huge ransom in exchange for leaving.