Q: Is 21,356 a Prime Number?
A: No, 21,356 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 21356 can be evenly divided by 1 2 4 19 38 76 281 562 1,124 5,339 10,678 and 21,356, with no remainder.
Since 21,356 cannot be divided by just 1 and 21,356, it is not a prime number.