Q: Is 218,421 a Prime Number?
A: No, 218,421 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 218421 can be evenly divided by 1 3 7 9 21 63 3,467 10,401 24,269 31,203 72,807 and 218,421, with no remainder.
Since 218,421 cannot be divided by just 1 and 218,421, it is not a prime number.