Determine if 1781 is divisible by 3, 6, 7, 8, and 9
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Let us determine if 1781 is divisible by 3, 6, 7, 8, and 9.
Since the last digit 1 is odd, we conclude that 1781 is not divisible by 2, and hence 1781 is not divisible by and 1781 is not divisible by .
Since the sum of digits is not divisible by 3 (and hence by 9), we conclude that 1781 is not divisible by and 1781 is not divisible by .
Taking into account that , , and is not divisible by 7, we conclude that 1781 is not divisible by 7.