General fact: 198 is the number of episodes that Woody Harrelson appeared as Woody Boyd in Cheers (of 273 episodes) between 1985-1993.
Mathematical fact: 198 is between the twin prime pair of 197 and 199.
Trivia: 198 is the population of Perlethorpe, Nottinghamshire England.
Historical date: July 16th is the day in 1910 that John Robertson Duigan makes the first flight of the Duigan pusher biplane, the first aircraft built in Australia.