Fatto generale: 2615 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 2615 is the number of functions from 9 unlabeled points to themselves.
Trivia: 2615 is a boring number.
Data storica: February 27th is the day in 1626 that Yuan Chonghuan is appointed Governor of Liaodong, after he led the Chinese into a great victory against the Manchurians under Nurhaci.