Q: Is 21,807 a Prime Number?
A: No, 21,807 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 21807 can be evenly divided by 1 3 9 2,423 7,269 and 21,807, with no remainder.
Since 21,807 cannot be divided by just 1 and 21,807, it is not a prime number.