198 (one hundred [and] ninety-eight) is the natural number following 197 and preceding 199.
In mathematics 198 is the smallest number that can be written as a sum of four positive squares in ten different ways. There are 198 positive palindromic numbers under 10,000. 198 is a Harshad number since the sum of the digits is 18, and which the sum is a whole number. 198 is a Pell–Lucas number. Its corresponding Pell number is 70. 198 is a practical number, and a 5-tuple of practical numbers. 198 is the only number such that it equals the sum of its digits times 1.1.
In other fields 198 is the number of ridges on a U.S. dollar coin.
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