30, 300 are two possible answer.
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Two. The prime numbers (factors) of 36 are: 2 and 3
30 & 60.
Because they have only two factors whereas composite numbers have more than two factors
2 and 3 are the smallest prime numbers. So answer is 2^3 * 3^3 = 216
The only two prime factors of 18 are: 2, 3