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Three is prime, because the number 3 only has 2 factors 1 and itself and the number 4 has 3 factors 1,2, and 4 (you can tell if a number is prime when it has 2 factors and if a number has more than 2 it is composite)
Three and they are: 1, 2 and 4
The number 6: with factors 1, 2, 3 and 6.
I belive it is 4. The factors of 4 are 1,4, and 2.
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.