Q: Is 21,333 a Prime Number?
A: No, 21,333 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 21333 can be evenly divided by 1 3 13 39 547 1,641 7,111 and 21,333, with no remainder.
Since 21,333 cannot be divided by just 1 and 21,333, it is not a prime number.