no 5 is not a composite number 10 15 20 and 25 are composite
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5 and 10 10 and 15 15 and 20
Numbers that are prime can't be multiples of 10. Multiples of 10 can't be odd.
The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40.
Three pairs of numbers with a GCF of 5 are: 5 and 10, 10 and 15, and 5 and 15.
5, 10 15, 20 500, 505