102 & 104
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101 is a prime number; it has no composite factors.
Prime numbers have two factors, composite numbers have more than two.
Of the numbers in your question, three are prime, and one is composite. The three prime numbers are 13, 37, and 101, and the composite number is 91. 91 is equal to 13 x 7.
Prime numbers have two factors; composite numbers have more than two.
Composite numbers are integers that have more than two factors.