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Yes. If the sum of a number's digits add up to 3 (or a multiple of 3) then the number is divisible by 3.

5 + 3 + 1 = 9 : as 9 is a multiple of 3 then 531 is divisible by 3 (177 x 3 = 531).

NOTE : A similar process applies to identify if a number is divisible by 9. If the sum of the number's digits add up to 9 (or a multiple of 9) then the number is divisible by 9.

5 + 3 + 1 = 9 : 531 = 59 x 9.

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