Rules for Divisibility :
2. Divisibility by 3 : A number is divisible by 3 if the sum of digit in the number is divisible by 3.
For example, take the number 4593, the sum of the digit is 4 + 5 + 9 + 3 = 21 which is a multiple of 3. Hence, the given number 4593 is divisible by 3.
Similarly 243, 987 etc.., are all divisible by 3. If we take the number 9562, the sum of the digit is 22 which is not a multiple of 3. Hence the number 9562 is not divisible by 3.
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