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That means that one number is a factor of the other number, but that it's not the number itself.

For example: the factors of 9 are 1, 3, and 9.

The proper factors of 9 are 1 and 3.

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9y ago
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9y ago

A proper factor of a natural number n, is any number p such that 1 < p < n and p divides n (without remainder). Clearly, n must be a composite number for it to have a proper factor.

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Q: What numbers are proper factors?
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