3*3 = 9
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The prime factorization of 9 is 3 x 3.
Prime Factorization of 90The 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 is2 X 3 X 3 X 5.
9x2x2x2 = 9 x 8 = 72 but it's not the prime factorization of 72 as 9=3x3 The prime factorization of 72 is 2x2x2x3x3 = 2^3 x 3^2
9 = 3²
3 x 3 = 9