Yes.
639/9 = 71
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No, its not divisible by 8. 639, is an odd numbers with the following divisors: 1, 3, 9, 71, 213, and itself.
603, 612, 621, 630, 639, 648, 657, 666, 675, 684, 693
639
71
81: 8 + 1 = 9 which is divisible by 9, so 81 is divisible by 9 162: 1 + 6 + 2 = 9 which is divisible by 9, so 162 is divisible by 9 199: 1 + 9 + 9 = 19 → 1 + 9 = 10 → 1 + 0 = 1 which is not divisible by 9, so 199 is not divisible by 9. 1125: 1 + 1 + 2 + 5 = 9 which is divisible by 9, so 1125 is divisible by 9. So 199 is the only one not divisible by 9.