Fait mathématique: 1546 is the number of 5×5 binary matrices with at most one 1 in each row and column.
Culture générale: 1546 is an unremarkable number.
Date historique: March 25th is the day in 1990 that the Happy Land fire was an arson fire that kills 87 people trapped inside an illegal nightclub in the New York City borough of The Bronx.