Q: Is 261,807 a Prime Number?
A: No, 261,807 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 261807 can be evenly divided by 1 3 7 13 21 39 49 91 137 147 273 411 637 959 1,781 1,911 2,877 5,343 6,713 12,467 20,139 37,401 87,269 and 261,807, with no remainder.
Since 261,807 cannot be divided by just 1 and 261,807, it is not a prime number.