4 × 9 = 36
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Yes, 123456789 is a multiple of 9
Yes, 324 is a multiple of 9 (324/9 = 36).
4 is a multiple of 2. 9 is a multiple of 3.
9 is a multiple of 3.
If the sum of the digits of a number is a multiple of 9, the number is a multiple of 9.