Q: Is 21,761 a Prime Number?
A: No, 21,761 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 21761 can be evenly divided by 1 47 463 and 21,761, with no remainder.
Since 21,761 cannot be divided by just 1 and 21,761, it is not a prime number.