Q: Is 21,524 a Prime Number?
A: No, 21,524 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 21524 can be evenly divided by 1 2 4 5,381 10,762 and 21,524, with no remainder.
Since 21,524 cannot be divided by just 1 and 21,524, it is not a prime number.