Fait général: 1556 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1556 is the sum of the squares.
Culture générale: 1556 is an unremarkable number.
Date historique: April 4th is the day in 1850 that the Great Fire of Cottenham, a large part of the Cambridgeshire village (England) is burnt to the ground under suspicious circumstances.