Q: Is 1,243,521 a Prime Number?
A: No, 1,243,521 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 1243521 can be evenly divided by 1 3 9 233 593 699 1,779 2,097 5,337 138,169 414,507 and 1,243,521, with no remainder.
Since 1,243,521 cannot be divided by just 1 and 1,243,521, it is not a prime number.