It can be. 44 is a proper factor of 88, among other numbers.
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It depends on the number being factored. 22 is a proper factor of 44. 22 is a factor, but not a proper factor, of 22.
The GCF is 44.
Since 11 is a factor of 44, it is automatically the GCF.
The longest factor string of 44 is contained within the longest factor string of 132.
The greatest common factor of 8 and 44 is 4.