Mathematical fact: 2616 is the number of graphs with 9 vertices and 6 cycles.
Trivia: 2616 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: February 28th is the day in 1993 that Bureau of Alcohol, Tobacco and Firearms agents raid the Branch Davidian church in Waco, Texas with a warrant to arrest the group's leader David Koresh.