Q: Is 1,243,215 a Prime Number?
A: No, 1,243,215 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 1243215 can be evenly divided by 1 3 5 9 15 27 45 135 9,209 27,627 46,045 82,881 138,135 248,643 414,405 and 1,243,215, with no remainder.
Since 1,243,215 cannot be divided by just 1 and 1,243,215, it is not a prime number.