Q: Is 216,621 a Prime Number?
A: No, 216,621 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 216621 can be evenly divided by 1 3 9 27 71 113 213 339 639 1,017 1,917 3,051 8,023 24,069 72,207 and 216,621, with no remainder.
Since 216,621 cannot be divided by just 1 and 216,621, it is not a prime number.