Q: Is 21,261 a Prime Number?
A: No, 21,261 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 21261 can be evenly divided by 1 3 19 57 373 1,119 7,087 and 21,261, with no remainder.
Since 21,261 cannot be divided by just 1 and 21,261, it is not a prime number.