Q: Is 817,820 a Prime Number?
A: No, 817,820 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 817820 can be evenly divided by 1 2 4 5 10 20 103 206 397 412 515 794 1,030 1,588 1,985 2,060 3,970 7,940 40,891 81,782 163,564 204,455 408,910 and 817,820, with no remainder.
Since 817,820 cannot be divided by just 1 and 817,820, it is not a prime number.