The prime factorization for 490 is: 2 x 5 x 7 x 7
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No, 3x5x4 is not a prime factorization of 60. A prime factorization of 60 would consist of only prime numbers. The prime factorization of 60 is 2x2x3x5.
When all the factors are prime numbers, that's a prime factorization.
Prime factorization!
The prime factors of 490 are 2 x 5 x 7 x 7.
There is no need to do prime factorization as prime numbers are already prime.