Q: Is 8,421 a Prime Number?
A: No, 8,421 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 8421 can be evenly divided by 1 3 7 21 401 1,203 2,807 and 8,421, with no remainder.
Since 8,421 cannot be divided by just 1 and 8,421, it is not a prime number.