Q: Is 21,743 a Prime Number?
A: No, 21,743 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 21743 can be evenly divided by 1 17 1,279 and 21,743, with no remainder.
Since 21,743 cannot be divided by just 1 and 21,743, it is not a prime number.