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To disprove this all you need to do if find one example of a prime that is not even. Such an example is called a counterexample.

If a statement that all such and such or every such and such has a certain property, all you have to do to disprove it it to demonstrate the existence of on such and such that lacks the property .

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Q: Prove and disprove the statement that every prime number is an even number?
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