181 is already prime.
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Prime factorization of 181 = 1x181.
The prime factorization of 4525 is 5 x 5 x 181.
No, 181 is a prime number. It is divisible only by 1 and itself.
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.