Q: Is 378,521 a Prime Number?
A: No, 378,521 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 378521 can be evenly divided by 1 11 13 143 2,647 29,117 34,411 and 378,521, with no remainder.
Since 378,521 cannot be divided by just 1 and 378,521, it is not a prime number.