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.
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No, 3 is a factor of 9.
No, 9 is a factor of 36.
A factor is a number that divides evenly into another number with no remainder. 3 is a factor of 9. 4 is not a factor of 9.
No, 9 is not a factor of either number.
9, 18, 27, 36 and so on.