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To check for divisibility by 6 you need to check for divisibility by 2 and by 3.

Divisibility by 2: If the number ends with a 0, 2, 4, 6 or 8 it is divisible by 2. If it is not then it is not divisible by 2 and so cannot be divisible by 6.

Divisibility by 6: If the digital root is divisible by 3 then the number is divisible by 3. If it is not then it is not divisble by 3 and so cannot be divisible by 6.

The digital root is simply the sum of all the digits in the number. And, if the answer has more than 2 digits, you can repeat the process as many times as you like.

For example, 7987

7+9+8+7 = 31

3+1 = 4

So the digital root of 7987 is 4. That is not divisible by 3 and so neither is 7987.

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Q: How can you check if a number is divisible by 6?
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If the last digit of a number is 6 then is 6 a factor?

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Is 1656 divisible by 3?

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