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3, 12, 30
No, 6 is not a factor of 3. A factor of a number is a whole number that can be multiplied to give the original number. In this case, 6 cannot be multiplied by any whole number to give 3, so 6 is not a factor of 3.
I think you might mean "multiple." If the sum of a number's digits is a multiple of 9, the original number is as well. If you want to know how you know if a number is a factor of 9, memorize the numbers 1, 3 and 9.
6 = (1+2+3) 6 = (1x2x3)
25 and 18 are a factor pair of 450 whose sum is 43.