A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4316400 can be evenly divided by 1 2 3 4 5 6 8 9 10 11 12 15 16 18 20 22 24 25 30 33 36 40 44 45 48 50 55 60 66 72 75 80 88 90 99 100 109 110 120 132 144 150 165 176 180 198 200 218 220 225 240 264 275 300 327 330 360 396 400 436 440 450 495 528 545 550 600 654 660 720 792 825 872 880 900 981 990 1,090 1,100 1,199 1,200 1,308 1,320 1,584 1,635 1,650 1,744 1,800 1,962 1,980 2,180 2,200 2,398 2,475 2,616 2,640 2,725 3,270 3,300 3,597 3,600 3,924 3,960 4,360 4,400 4,796 4,905 4,950 5,232 5,450 5,995 6,540 6,600 7,194 7,848 7,920 8,175 8,720 9,592 9,810 9,900 10,791 10,900 11,990 13,080 13,200 14,388 15,696 16,350 17,985 19,184 19,620 19,800 21,582 21,800 23,980 24,525 26,160 28,776 29,975 32,700 35,970 39,240 39,600 43,164 43,600 47,960 49,050 53,955 57,552 59,950 65,400 71,940 78,480 86,328 89,925 95,920 98,100 107,910 119,900 130,800 143,880 172,656 179,850 196,200 215,820 239,800 269,775 287,760 359,700 392,400 431,640 479,600 539,550 719,400 863,280 1,079,100 1,438,800 2,158,200 and 4,316,400, with no remainder.
Since 4,316,400 cannot be divided by just 1 and 4,316,400, it is not a prime number.