A Prime number is a number that has only 2 factors, itself, and 1. For multiplying, your product is always a composite number, a number that has 3 or more factors. 1 is neither, 2 is neither.
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If you mean 314159 then it is a prime number
No, but if you mean 2 and 23 then they are both prime numbers
To express a composite number as the product of its prime factors.
Prime numbers have only two factors, one and themselves. The number 5 is prime.
First of something.