Q: Is 261,513 a Prime Number?
A: No, 261,513 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 261513 can be evenly divided by 1 3 7 9 21 49 63 147 441 593 1,779 4,151 5,337 12,453 29,057 37,359 87,171 and 261,513, with no remainder.
Since 261,513 cannot be divided by just 1 and 261,513, it is not a prime number.