Q: Is 261,521 a Prime Number?
A: No, 261,521 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 261521 can be evenly divided by 1 13 20,117 and 261,521, with no remainder.
Since 261,521 cannot be divided by just 1 and 261,521, it is not a prime number.