Fait mathématique: 1623 is an unremarkable number.
Culture générale: 1623 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: June 10th is the day in 1786 that a landslide dam on the Dadu River created by an earthquake ten days earlier collapses, killing 100,000 in the Sichuan province of China.