Fatto generale: 5548 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 5548 is an unremarkable number.
Trivia: 5548 is a boring number.
Data storica: March 10th is the day in 1945 that the U.S. Army Air Force firebombs Tokyo, and the resulting firestorm kills more than 100,000 people, mostly civilians.