31
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It is 313 because .9 is greater than .5
313.0
It is already rounded to a tenth as 312.5
300
The number 313 is a prime number, which means it is only divisible by 1 and itself. Therefore, the prime factorization of 313 is simply 313 x 1. Prime factorization is the process of breaking down a number into its prime factors, but since 313 is already a prime number, it cannot be further factored.