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How do you know immediately that 2,056 in not a prime number

How do you know immediately that 2,056 in not a prime number
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How do you know immediately that 2,056 in not a prime number

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User Bdrajer
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You just have to look at the last number.And the last number is 6. And six is not a prime but a composite/even.

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User Ndvo
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