No.
The multiples of 3 are the times table of 3:
3 x 1 = 3
3 x 2 = 6
3 x 3 = 9
3 x 4 = 12
etc
one IS a FACTOR of three though, as it divided into 3 with no remainder. The factors of 3 are 1 and 3.
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Three is not a multiple of six. Six is a multiple of three. And three is a factor of six.
If you mean what is the multiple OF three, the answer is 9
420
If the sum of the digits is a multiple of three, the whole number is a multiple of three.
9 isn't prime, but one three-digit multiple of 18 is 108.