Any number whose digits add up to 9 is also a multiple of 9 as for example 162 is 1+6+2 = 9 and 9*18 = 162
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No. 9 is not a multiple of 522, but 522 is a multiple of 9.No but 522 is a multiple of 9
yes 9 is a multiple of 99
9 is a multiple of 9 because 1 x 9 = 9
No, 12 is not a multiple of 9
no,93 is not a multiple of 9