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Because that is the definition of an even number - one that is divisible by 2, that is, one that has 2 as a factor.

All even numbers can be divided equally by 2. That is, when divided by 2, any even number will result in a whole number, exactly 1/2 of the original number. That number, when multiplied by 2 will always result in the original even number. This does not hold true for odd numbers.

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15y ago

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