Q: Is 21,435 a Prime Number?
A: No, 21,435 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 21435 can be evenly divided by 1 3 5 15 1,429 4,287 7,145 and 21,435, with no remainder.
Since 21,435 cannot be divided by just 1 and 21,435, it is not a prime number.