Q: Is 21,637 a Prime Number?
A: No, 21,637 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 21637 can be evenly divided by 1 7 11 77 281 1,967 3,091 and 21,637, with no remainder.
Since 21,637 cannot be divided by just 1 and 21,637, it is not a prime number.