Q: Is 261,509 a Prime Number?
A: Yes, 261,509 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 261509 can be evenly divided by 1 and 261,509, with no remainder.
Since 261,509 can be divided by just 1 and 261,509, it is a prime number.