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 Description  
 Proper Factor:  All factors of a number other than 1 and the number itself.

For example

The number 6 has proper factors 2, and 3. 1 and 6 are also factors, but they are not proper factors.

The number 16 has proper factors 2, 4, and 8. 1 and 16 are also factors, but they are not proper factors.