Very hard to answer this question because you didn't give any bounds for the problem.
Here are just SOME of the things that equals 198.
197+1
199-1
99*2
33*6
396/2
398/2 - 1
1+1+1+1+1+...+1 (where 1 is written 198 times)
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198 divided by 2 equals 99. 99 times 2 equals 198.
33x6 equals 198.
16.5
it goes into 18 11 times
The factor pairs of 198 are 1 x 198, 2 x 99, 3 x 66, 6 x 33, 9 x 22, and 11 x 18.