No, take 9 for example. It has 1,9, and 3 as factors, so it's not prime.
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That's not true.
Yes, a composite number is a positive integer which has a positive divisor other than one or itself. By definition, every integer greater than one is either a prime number or a composite number and since 2 is the only even prime number the result is every number greater than 2 is a composite number
Every even number greater than 2 is composite.
53 is a prime number that is greater than 50
67 is a prime number; 38, like every even number greater than 2, is a composite number.