Q: Is 278,640 a Prime Number?
A: No, 278,640 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 278640 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 36 40 43 45 48 54 60 72 80 81 86 90 108 120 129 135 144 162 172 180 215 216 240 258 270 324 344 360 387 405 430 432 516 540 645 648 688 720 774 810 860 1,032 1,080 1,161 1,290 1,296 1,548 1,620 1,720 1,935 2,064 2,160 2,322 2,580 3,096 3,240 3,440 3,483 3,870 4,644 5,160 5,805 6,192 6,480 6,966 7,740 9,288 10,320 11,610 13,932 15,480 17,415 18,576 23,220 27,864 30,960 34,830 46,440 55,728 69,660 92,880 139,320 and 278,640, with no remainder.
Since 278,640 cannot be divided by just 1 and 278,640, it is not a prime number.