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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.
6 is not divisible by 162. 162 is divisible by 6.
No.
162 is divisible by: 1, 2, 3, 6, 9, 18, 27, 54, 81, and 162 You can make a factor tree or just try one number at a time starting from 1, which would be really slow
According to my calculations, the following are evenly divisible by 9: 108, 117, 126, 135, 144, 153, 162, 171, 180, 189, and 198.