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All numbers can be broken down into factor pairs. No matter how many pairs there are, it's an even number of factors. Squares have a factor pair that consists of the same number twice. When you list them, you list the number once.

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Wiki User

12y ago

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More answers

Because it's mathematically proven ;)

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Wiki User

12y ago
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36, 144, many others.

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Wiki User

9y ago
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Itself and any other multiples of 4

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Wiki User

7y ago
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1

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Anonymous

4y ago
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Q: Why do all numbers other than square numbers have even factors?
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