345
/\
3115
....../\
....5 23
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392 = 2 x 2 x 2 x 7 x 7 OR 2^3 x 7^2
As a product of its prime factors: 3*5*23 = 345
35 can be a factor, but it is not prime.
There is no factorization. 37 is a prime number.37 is already prime. Its only prime factor is itself.
81 is not prime. Its prime factorization is 3x3x3x3.