general_fact: 198 is the rank of Best of Little Walter (1964) by Little Walter on Rolling Stone magazine's list of the 500 Greatest Albums of All Time.
math_fact: 198 is a Harshad number, divisible by the sum of its digits.
trivia: 198 is the rank of Marshall Islands in world population.
historical_date: July 16th is the day in 622 that the beginning of the Islamic calendar.