Q: Is 21,430 a Prime Number?
A: No, 21,430 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 21430 can be evenly divided by 1 2 5 10 2,143 4,286 10,715 and 21,430, with no remainder.
Since 21,430 cannot be divided by just 1 and 21,430, it is not a prime number.