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Prime Factorization of 90

The prime factorization of 90 is not 2 X 5 X 9 because 9 is not a Prime number. It can be factored into 3 X 3, which are prime numbers, so the prime factorization of 90 is

2 X 3 X 3 X 5.

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14y ago
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Q: Why is the prime factorization of 90 not 2 x 5 x 9?
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