The prime factorization of 455 is: 5 x 7 x 13
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The number 455 ends with a 5, thus it is divisible by 5; 455/5 = 91. 91 is a tricky number, because it's hard to tell that it's not prime. If you couldn't see that 91 is divisible by 7, then I recommend expanding your multiplication table for 7. 91/7 = 13, and since both 7 and 13 are prime numbers, the prime factorization of 455 is 5 X 7 X 13.
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.
The prime factors of 455 are 5 x 7 x 13
When all the factors are prime numbers, that's a prime factorization.
Prime factorization!