138 is a composite number. A Prime number has exactly 2 factors, 1 and the number itself. All even numbers greater than 2 (numbers ending in 2, 4, 6, 8, or 0) are composites because they have more than 2 factors.
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Yes.
For starters: it's even, and thus divisible by 2.
138 = 2 x 3 x 23.
It is divisible by 2, 3, 6, 23, 46, and 69.