Q: Is 278,208 a Prime Number?
A: No, 278,208 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 278208 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 23 24 27 28 32 36 42 46 48 54 56 63 64 69 72 84 92 96 108 112 126 138 144 161 168 184 189 192 207 216 224 252 276 288 322 336 368 378 414 432 448 483 504 552 576 621 644 672 736 756 828 864 966 1,008 1,104 1,242 1,288 1,344 1,449 1,472 1,512 1,656 1,728 1,932 2,016 2,208 2,484 2,576 2,898 3,024 3,312 3,864 4,032 4,347 4,416 4,968 5,152 5,796 6,048 6,624 7,728 8,694 9,936 10,304 11,592 12,096 13,248 15,456 17,388 19,872 23,184 30,912 34,776 39,744 46,368 69,552 92,736 139,104 and 278,208, with no remainder.
Since 278,208 cannot be divided by just 1 and 278,208, it is not a prime number.