2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,and 97 are all prime numbers. The rest are composite
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All numbers have factors. Some factors are prime numbers, some are composite numbers. A factor that is a composite number is a composite factor.
All composite numbers have more than two factors whereas prime numbers have only two factors
Its only factors are itself and one because 73 is a prime number
squares of prime numbers
Factor it. Prime numbers have two factors, composite numbers have more than two.