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Is 988876 divisible by 3?

No. A number is divisible by 3 if, and only if, the sum of its digits is also divisible by 3. The test can be repeated on the sum, so repeatedly sum the digits (MORE)

Is 745 divisible by 2 3 5 9 or 10?

Out of that list, just 5. To be divisible by 2 the last digit must be even, ie one of {0, 2, 4, 6, 8} The last digit is 5 which is not even (it is odd), so 745 i (MORE)