Q: Is 21,136 a Prime Number?
A: No, 21,136 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 21136 can be evenly divided by 1 2 4 8 16 1,321 2,642 5,284 10,568 and 21,136, with no remainder.
Since 21,136 cannot be divided by just 1 and 21,136, it is not a prime number.