Fait général: 1584 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1584 is an unremarkable number.
Culture générale: 1584 is a boring number.
Date historique: May 2nd is the day in 1879 that the Spanish Socialist Worker's Party is founded in Casa Labra Pub (city of Madrid) by the historical Spanish workers' leader Pablo Iglesias.