A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9543840 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 30 32 40 48 59 60 80 96 118 120 160 177 236 240 295 337 354 472 480 590 674 708 885 944 1,011 1,180 1,348 1,416 1,685 1,770 1,888 2,022 2,360 2,696 2,832 3,370 3,540 4,044 4,720 5,055 5,392 5,664 6,740 7,080 8,088 9,440 10,110 10,784 13,480 14,160 16,176 19,883 20,220 26,960 28,320 32,352 39,766 40,440 53,920 59,649 79,532 80,880 99,415 119,298 159,064 161,760 198,830 238,596 298,245 318,128 397,660 477,192 596,490 636,256 795,320 954,384 1,192,980 1,590,640 1,908,768 2,385,960 3,181,280 4,771,920 and 9,543,840, with no remainder.
Since 9,543,840 cannot be divided by just 1 and 9,543,840, it is not a prime number.