Q: Is 243,621 a Prime Number?
A: No, 243,621 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 243621 can be evenly divided by 1 3 7 9 21 27 63 189 1,289 3,867 9,023 11,601 27,069 34,803 81,207 and 243,621, with no remainder.
Since 243,621 cannot be divided by just 1 and 243,621, it is not a prime number.