A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6984900 can be evenly divided by 1 2 3 4 5 6 9 10 12 13 15 18 20 25 26 27 30 36 39 45 50 52 54 60 65 75 78 90 100 108 117 130 135 150 156 180 195 199 225 234 260 270 300 325 351 390 398 450 468 540 585 597 650 675 702 780 796 900 975 995 1,170 1,194 1,300 1,350 1,404 1,755 1,791 1,950 1,990 2,340 2,388 2,587 2,700 2,925 2,985 3,510 3,582 3,900 3,980 4,975 5,174 5,373 5,850 5,970 7,020 7,164 7,761 8,775 8,955 9,950 10,348 10,746 11,700 11,940 12,935 14,925 15,522 17,550 17,910 19,900 21,492 23,283 25,870 26,865 29,850 31,044 35,100 35,820 38,805 44,775 46,566 51,740 53,730 59,700 64,675 69,849 77,610 89,550 93,132 107,460 116,415 129,350 134,325 139,698 155,220 179,100 194,025 232,830 258,700 268,650 279,396 349,245 388,050 465,660 537,300 582,075 698,490 776,100 1,164,150 1,396,980 1,746,225 2,328,300 3,492,450 and 6,984,900, with no remainder.
Since 6,984,900 cannot be divided by just 1 and 6,984,900, it is not a prime number.