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91 has more than 2 factors. It is composite.
It has more than three factors which are: 1 2 3 4 6 9 12 18 and 36
144 has 15 factors: 1 2 3 4 6 8 9 12 16 18 24 36 48 72 144.
The factors of 18 are: 1 2 3 6 9 18 The prime factors are: 2 x 3 x 3
The factors of 18 are 1, 2, 3, 6, 9, and 18. The prime factors are 2, 3 and 3.