3 x 3 x 23 = 207
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207 is not a prime number because it gets divided by 3.
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 207 is composite.
You need at least two numbers to find a GCF. The prime factorization of 207 is 3 x 3 x 23.
factors of 621 are: 1, 3, 9, 23, 27, 69, 207, 621 prime factors of 621 are: 3, 23. prime factorization of 621 are: 3 x 3 x 3 x 23
7 is a prime number!