General fact: 2493 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 2493 is an uninteresting number.
Trivia: 2493 is an unremarkable number.
Historical date: October 28th is the day in 1891 that the Mino-Owari earthquake, the largest inland earthquake in Japan's history, strikes Gifu Prefecture.