Hecho general: 15498 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 15498 is an unremarkable number.
Trivia: 15498 is a boring number.
Fecha histórica: June 6th is the day in 1809 that Sweden promulgates a new Constitution, which restores political power to the Riksdag of the Estates after 20 years of Enlightened absolutism.