Prime numbers only have one and themselves as factors.
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The math teacher taught the students about prime numbers.
Use the prime factorizations to determine the GCF. If the GCF is 1, the numbers are relatively prime. If the two numbers have no prime factors in common, they are relatively prime.
If the prime factorizations have no prime factors in common, the numbers are relatively prime.
You can use prime numbers to factorize numbers, a very useful tool
Humans sometimes use prime numbers when doing mathematics.