Q: Is 400,816 a Prime Number?
A: No, 400,816 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 400816 can be evenly divided by 1 2 4 8 13 16 26 41 47 52 82 94 104 164 188 208 328 376 533 611 656 752 1,066 1,222 1,927 2,132 2,444 3,854 4,264 4,888 7,708 8,528 9,776 15,416 25,051 30,832 50,102 100,204 200,408 and 400,816, with no remainder.
Since 400,816 cannot be divided by just 1 and 400,816, it is not a prime number.