The multiples (not multaples) are of the form 54*k where k is any integer. So try 54*1, 54*2 and so on. When you have done infinitely many of them, you can stop!
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54 = 1 x 54 54 = 2 x 27 54 = 3 x 18 54 = 6 x 9
It is: 54
The first ten positive integer multiples of 54 are: 1 x 54 = 54 2 x 54 = 108 3 x 54 = 162 4 x 54 = 216 5 x 54 = 270 6 x 54 = 324 7 x 54 = 378 8 x 54 = 432 9 x 54 = 486 10 x 54 = 540
1,2,3,6,9,18,27,54
No. 54 isn't prime.