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squares of prime numbers
57 is a composite number with factors 3 and 19.
Composite numbers are numbers greater than 1 that have more than two factors. Relatively prime numbers are numbers that have no common factors other than 1. Therefore, to find 3-digit composite numbers that are relatively prime, we need to look for numbers that are composite and have no common factors. An example of such a pair of 3-digit composite numbers that are relatively prime would be 119 and 143.
All composite numbers have more than two factors whereas prime numbers have only two factors
Prime numbers have only 2 factors, 1 and itself. Composite numbers have 3 or more factors. 1 has only 1 factor, so it is neither a prime number or a composite number.