5 is a Prime number therefore 5 doesn't have any factors but one and itself.
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Another contributor noticed:
Almost everything about this question is wrong.
-- The 'G' in "GCF" stands for "Greatest". There can only be
one 'greatest', not a list of them.
-- The 'C' in "GCF" stands for "Common". "Common" means "same for all".
There's nothing common about 5. There's no such thing as a GCF or anything
else common, until you have at least two numbers.
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The greatest common factor of 5 and 5 is 5.
5 x 5 x 5 x 5
275 = 5*5*11275 = 5*5*11275 = 5*5*11275 = 5*5*11
625 = 5 x 5 x 5 x 5 (54)
The greatest common factor of 5 and 25 is 5.