Q: Is 21,873 a Prime Number?
A: No, 21,873 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 21873 can be evenly divided by 1 3 23 69 317 951 7,291 and 21,873, with no remainder.
Since 21,873 cannot be divided by just 1 and 21,873, it is not a prime number.