Q: Is 21,008 a Prime Number?
A: No, 21,008 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 21008 can be evenly divided by 1 2 4 8 13 16 26 52 101 104 202 208 404 808 1,313 1,616 2,626 5,252 10,504 and 21,008, with no remainder.
Since 21,008 cannot be divided by just 1 and 21,008, it is not a prime number.