A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2366980 can be evenly divided by 1 2 4 5 7 10 11 14 20 22 28 29 35 44 53 55 58 70 77 106 110 116 140 145 154 203 212 220 265 290 308 319 371 385 406 530 580 583 638 742 770 812 1,015 1,060 1,166 1,276 1,484 1,537 1,540 1,595 1,855 2,030 2,233 2,332 2,915 3,074 3,190 3,710 4,060 4,081 4,466 5,830 6,148 6,380 7,420 7,685 8,162 8,932 10,759 11,165 11,660 15,370 16,324 16,907 20,405 21,518 22,330 30,740 33,814 40,810 43,036 44,660 53,795 67,628 81,620 84,535 107,590 118,349 169,070 215,180 236,698 338,140 473,396 591,745 1,183,490 and 2,366,980, with no remainder.
Since 2,366,980 cannot be divided by just 1 and 2,366,980, it is not a prime number.