Since it can be evenly divided by a factor other than itself and 1, 123,123,123 is a composite number.
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123123123 is a composite number. 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.
7 is a prime number!
109 is a prime number.
167 is a prime number.
503 is a prime number.