Because - if you add all the digits from the number together - they're also exactly divisible by 9. 1+5+7+7+7=27. 27/9=3.
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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