A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1713600 can be evenly divided by 1 2 3 4 5 6 7 8 9 10 12 14 15 16 17 18 20 21 24 25 28 30 32 34 35 36 40 42 45 48 50 51 56 60 63 64 68 70 72 75 80 84 85 90 96 100 102 105 112 119 120 126 136 140 144 150 153 160 168 170 175 180 192 200 204 210 224 225 238 240 252 255 272 280 288 300 306 315 320 336 340 350 357 360 400 408 420 425 448 450 476 480 504 510 525 544 560 576 595 600 612 630 672 680 700 714 720 765 800 816 840 850 900 952 960 1,008 1,020 1,050 1,071 1,088 1,120 1,190 1,200 1,224 1,260 1,275 1,344 1,360 1,400 1,428 1,440 1,530 1,575 1,600 1,632 1,680 1,700 1,785 1,800 1,904 2,016 2,040 2,100 2,142 2,240 2,380 2,400 2,448 2,520 2,550 2,720 2,800 2,856 2,880 2,975 3,060 3,150 3,264 3,360 3,400 3,570 3,600 3,808 3,825 4,032 4,080 4,200 4,284 4,760 4,800 4,896 5,040 5,100 5,355 5,440 5,600 5,712 5,950 6,120 6,300 6,720 6,800 7,140 7,200 7,616 7,650 8,160 8,400 8,568 8,925 9,520 9,792 10,080 10,200 10,710 11,200 11,424 11,900 12,240 12,600 13,600 14,280 14,400 15,300 16,320 16,800 17,136 17,850 19,040 20,160 20,400 21,420 22,848 23,800 24,480 25,200 26,775 27,200 28,560 30,600 33,600 34,272 35,700 38,080 40,800 42,840 47,600 48,960 50,400 53,550 57,120 61,200 68,544 71,400 81,600 85,680 95,200 100,800 107,100 114,240 122,400 142,800 171,360 190,400 214,200 244,800 285,600 342,720 428,400 571,200 856,800 and 1,713,600, with no remainder.
Since 1,713,600 cannot be divided by just 1 and 1,713,600, it is not a prime number.