Fatto generale: 1626 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1626 is the number of binary partitions of 31.
Trivia: 1626 is an unremarkable number.
Data storica: June 13th is the day in 2010 that a capsule of the Japanese spacecraft Hayabusa, containing particles of the asteroid 25143 Itokawa, returns to Earth.