Q: Is 121,509 a Prime Number?
A: No, 121,509 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 121509 can be evenly divided by 1 3 9 23 69 207 587 1,761 5,283 13,501 40,503 and 121,509, with no remainder.
Since 121,509 cannot be divided by just 1 and 121,509, it is not a prime number.