Q: Is 405,216 a Prime Number?
A: No, 405,216 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 405216 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 27 28 32 36 42 48 54 56 63 67 72 84 96 108 112 126 134 144 168 189 201 216 224 252 268 288 336 378 402 432 469 504 536 603 672 756 804 864 938 1,008 1,072 1,206 1,407 1,512 1,608 1,809 1,876 2,016 2,144 2,412 2,814 3,024 3,216 3,618 3,752 4,221 4,824 5,628 6,048 6,432 7,236 7,504 8,442 9,648 11,256 12,663 14,472 15,008 16,884 19,296 22,512 25,326 28,944 33,768 45,024 50,652 57,888 67,536 101,304 135,072 202,608 and 405,216, with no remainder.
Since 405,216 cannot be divided by just 1 and 405,216, it is not a prime number.