Q: Is 509,681 a Prime Number?
A: Yes, 509,681 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 509681 can be evenly divided by 1 and 509,681, with no remainder.
Since 509,681 can be divided by just 1 and 509,681, it is a prime number.