5 is a Prime number having 1 and 5 as its only factors. It makes no difference to the factors of 5 if the digit 5 is in composite numbers.
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9, 15, 45 are the composite factors of 45.
The number 25 is a composite number. The factors of 25 other than 1 and itself are prime numbers (5 X 5).
All numbers have factors. Some factors are prime numbers, some are composite numbers. A factor that is a composite number is a composite factor.
Some factors are prime numbers, some are composite.
The number 5 is prime. Factors refer to whole numbers, not decimals.