Q: Is 21,908 a Prime Number?
A: No, 21,908 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 21908 can be evenly divided by 1 2 4 5,477 10,954 and 21,908, with no remainder.
Since 21,908 cannot be divided by just 1 and 21,908, it is not a prime number.