Q: Is 1,378,321 a Prime Number?
A: No, 1,378,321 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 1378321 can be evenly divided by 1 7 23 49 161 1,127 1,223 8,561 28,129 59,927 196,903 and 1,378,321, with no remainder.
Since 1,378,321 cannot be divided by just 1 and 1,378,321, it is not a prime number.