A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2910600 can be evenly divided by 1 2 3 4 5 6 7 8 9 10 11 12 14 15 18 20 21 22 24 25 27 28 30 33 35 36 40 42 44 45 49 50 54 55 56 60 63 66 70 72 75 77 84 88 90 98 99 100 105 108 110 120 126 132 135 140 147 150 154 165 168 175 180 189 196 198 200 210 216 220 225 231 245 252 264 270 275 280 294 297 300 308 315 330 350 360 378 385 392 396 420 440 441 450 462 490 495 504 525 539 540 550 588 594 600 616 630 660 675 693 700 735 756 770 792 825 840 882 900 924 945 980 990 1,050 1,078 1,080 1,100 1,155 1,176 1,188 1,225 1,260 1,320 1,323 1,350 1,386 1,400 1,470 1,485 1,512 1,540 1,575 1,617 1,650 1,764 1,800 1,848 1,890 1,925 1,960 1,980 2,079 2,100 2,156 2,200 2,205 2,310 2,376 2,450 2,475 2,520 2,646 2,695 2,700 2,772 2,940 2,970 3,080 3,150 3,234 3,300 3,465 3,528 3,675 3,780 3,850 3,960 4,158 4,200 4,312 4,410 4,620 4,725 4,851 4,900 4,950 5,292 5,390 5,400 5,544 5,775 5,880 5,940 6,300 6,468 6,600 6,615 6,930 7,350 7,425 7,560 7,700 8,085 8,316 8,820 9,240 9,450 9,702 9,800 9,900 10,395 10,584 10,780 11,025 11,550 11,880 12,600 12,936 13,230 13,475 13,860 14,553 14,700 14,850 15,400 16,170 16,632 17,325 17,640 18,900 19,404 19,800 20,790 21,560 22,050 23,100 24,255 26,460 26,950 27,720 29,106 29,400 29,700 32,340 33,075 34,650 37,800 38,808 40,425 41,580 44,100 46,200 48,510 51,975 52,920 53,900 58,212 59,400 64,680 66,150 69,300 72,765 80,850 83,160 88,200 97,020 103,950 107,800 116,424 121,275 132,300 138,600 145,530 161,700 194,040 207,900 242,550 264,600 291,060 323,400 363,825 415,800 485,100 582,120 727,650 970,200 1,455,300 and 2,910,600, with no remainder.
Since 2,910,600 cannot be divided by just 1 and 2,910,600, it is not a prime number.