Q: Is 216,821 a Prime Number?
A: No, 216,821 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 216821 can be evenly divided by 1 11 23 253 857 9,427 19,711 and 216,821, with no remainder.
Since 216,821 cannot be divided by just 1 and 216,821, it is not a prime number.