22 x 3 = 12
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22 X 31
12 is a composite number, not a prime factor.
12 = 2 x 2 x 3Alternatively, using power notation:12 = 22 x 32 x 2 x 3 = 12
12 is a composite number that is a multiple of 2. 12 is not a prime number.
That's the prime factorization of 140.