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Of those, 5 is not composite.
The sum of 5 composite numbers can be either composite, or prime, depending on the case.
0 is a composite number. 5 is prime.
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.
All numbers that are greater than 5 and end in 5 are composite numbers because they are divisible by 5 in addition to 1 and the number itself. 655 is therefore a composite number.