Q: Is 1,378,820 a Prime Number?
A: No, 1,378,820 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 1378820 can be evenly divided by 1 2 4 5 10 20 71 142 284 355 710 971 1,420 1,942 3,884 4,855 9,710 19,420 68,941 137,882 275,764 344,705 689,410 and 1,378,820, with no remainder.
Since 1,378,820 cannot be divided by just 1 and 1,378,820, it is not a prime number.