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
No, 2x2x5 is not a prime factorization because 2 is not a prime factor. A prime factorization is a representation of a number as a product of prime numbers. In this case, the prime factorization of 2x2x5 would be 2x2x5 or 2^2x5.
That's the prime factorization of 140.