A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8953440 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 23 24 30 32 40 46 48 60 69 80 92 96 115 120 138 160 184 230 240 276 345 368 460 480 552 690 736 811 920 1,104 1,380 1,622 1,840 2,208 2,433 2,760 3,244 3,680 4,055 4,866 5,520 6,488 8,110 9,732 11,040 12,165 12,976 16,220 18,653 19,464 24,330 25,952 32,440 37,306 38,928 48,660 55,959 64,880 74,612 77,856 93,265 97,320 111,918 129,760 149,224 186,530 194,640 223,836 279,795 298,448 373,060 389,280 447,672 559,590 596,896 746,120 895,344 1,119,180 1,492,240 1,790,688 2,238,360 2,984,480 4,476,720 and 8,953,440, with no remainder.
Since 8,953,440 cannot be divided by just 1 and 8,953,440, it is not a prime number.