Q: Is 428,421 a Prime Number?
A: No, 428,421 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 428421 can be evenly divided by 1 3 7 21 23 69 161 483 887 2,661 6,209 18,627 20,401 61,203 142,807 and 428,421, with no remainder.
Since 428,421 cannot be divided by just 1 and 428,421, it is not a prime number.