Q: Is 21,689 a Prime Number?
A: No, 21,689 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 21689 can be evenly divided by 1 23 41 529 943 and 21,689, with no remainder.
Since 21,689 cannot be divided by just 1 and 21,689, it is not a prime number.