Q: Is 1,231,509 a Prime Number?
A: No, 1,231,509 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1231509 can be evenly divided by 1 3 479 857 1,437 2,571 410,503 and 1,231,509, with no remainder.
Since 1,231,509 cannot be divided by just 1 and 1,231,509, it is not a prime number.