Is 646 divisible by 9?

Is 646 divisible by 9?
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6 + 4 + 6 = 161 + 6 = 7→ No; 646 is not divisible by 9 (there is a remainder of 7).-----------------------------------------Only if the sum of the digits is divisible by 9 is the originalnumber divisible by 9.Repeat the test on the sum until a single digit remains; only ifthis single digit is 9 is the original number divisible by 9,otherwise this single digit is the remainder when the originalnumber is divided by 9.
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