Fatto matematico: 9888 is the number of connected graphs with 8 vertices whose complements are also connected.
Trivia: 9888 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: January 26th is the day in 1564 that the Grand Duchy of Lithuania defeats the Tsardom of Russia in the Battle of Ula during the Livonian War.