50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100 (including 50 and 100).
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All of them except 83, 89 and 97 which are prime numbers
Search the Internet for a list of prime numbers - the Wikipedia article on prime numbers might list a few. All numbers between 2-100 that are not prime, are composite. (The number is not counted as prime, nor as composite.)
Look for a table of prime numbers. All the odd numbers that are NOT on this list are composite numbers.
They are all the numbers except 79 83 89 and 97 which are prime numbers because they have only two factors.
No, all composite.