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I think that it is 4
The number 1 or a factor.
a prime number
You are probably referring to a 'prime' number which has only the number 1 and itself as factors.
If you disregard 1 and the number itself, then 12, with the factors 2, 3, 4 and 6. If you include 1 and the number itself, then 6 with factors 1, 2, 3 and 6.