Q: Is 815,420 a Prime Number?
A: No, 815,420 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 815420 can be evenly divided by 1 2 4 5 10 20 40,771 81,542 163,084 203,855 407,710 and 815,420, with no remainder.
Since 815,420 cannot be divided by just 1 and 815,420, it is not a prime number.