A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1120680 can be evenly divided by 1 2 3 4 5 6 8 9 10 11 12 15 18 20 22 24 30 33 36 40 44 45 55 60 66 72 88 90 99 110 120 132 165 180 198 220 264 283 330 360 396 440 495 566 660 792 849 990 1,132 1,320 1,415 1,698 1,980 2,264 2,547 2,830 3,113 3,396 3,960 4,245 5,094 5,660 6,226 6,792 8,490 9,339 10,188 11,320 12,452 12,735 15,565 16,980 18,678 20,376 24,904 25,470 28,017 31,130 33,960 37,356 46,695 50,940 56,034 62,260 74,712 93,390 101,880 112,068 124,520 140,085 186,780 224,136 280,170 373,560 560,340 and 1,120,680, with no remainder.
Since 1,120,680 cannot be divided by just 1 and 1,120,680, it is not a prime number.