9 is.
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9 is a multiple of 3. (3x3=9)
No, 9 is a multiple of 3. 3 is a factor of 9.
Any integer multiple of 9. For example 18, or 99.
No factor of 9 has three digits. 450 is a three-digit multiple of 150 (and of 9) with a digit sum of 9.
Add up the digits of 291. If they total a multiple of 9, 9 is a factor.