Q: Is 21,124 a Prime Number?
A: No, 21,124 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 21124 can be evenly divided by 1 2 4 5,281 10,562 and 21,124, with no remainder.
Since 21,124 cannot be divided by just 1 and 21,124, it is not a prime number.