Q: Is 312,509 a Prime Number?
A: Yes, 312,509 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 312509 can be evenly divided by 1 and 312,509, with no remainder.
Since 312,509 can be divided by just 1 and 312,509, it is a prime number.