a natural number means any number from 1-9
a proper factor is a number which can be multiplied with another number to make a certain product.
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It has more than two factors.
If you mean 2, 3 and 7 as factors then the smallest number is 42
Factors of 6 1,2,3,6 Factors of 3 1,3 (this mean that 3 is a prime number)
It means "to express a number or expression as a product of factors."
1 1,2 1,3 1,2,4 1,2,3,6 1,2,3,4,6,12