Q: Is 21,749 a Prime Number?
A: No, 21,749 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 21749 can be evenly divided by 1 7 13 91 239 1,673 3,107 and 21,749, with no remainder.
Since 21,749 cannot be divided by just 1 and 21,749, it is not a prime number.