A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4620240 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 23 24 27 30 31 36 40 45 46 48 54 60 62 69 72 80 81 90 92 93 108 115 120 124 135 138 144 155 162 180 184 186 207 216 230 240 248 270 276 279 310 324 345 360 368 372 405 414 432 460 465 496 540 552 558 620 621 648 690 713 720 744 810 828 837 920 930 1,035 1,080 1,104 1,116 1,240 1,242 1,296 1,380 1,395 1,426 1,488 1,620 1,656 1,674 1,840 1,860 1,863 2,070 2,139 2,160 2,232 2,480 2,484 2,511 2,760 2,790 2,852 3,105 3,240 3,312 3,348 3,565 3,720 3,726 4,140 4,185 4,278 4,464 4,968 5,022 5,520 5,580 5,704 6,210 6,417 6,480 6,696 7,130 7,440 7,452 8,280 8,370 8,556 9,315 9,936 10,044 10,695 11,160 11,408 12,420 12,555 12,834 13,392 14,260 14,904 16,560 16,740 17,112 18,630 19,251 20,088 21,390 22,320 24,840 25,110 25,668 28,520 29,808 32,085 33,480 34,224 37,260 38,502 40,176 42,780 49,680 50,220 51,336 57,040 57,753 64,170 66,960 74,520 77,004 85,560 96,255 100,440 102,672 115,506 128,340 149,040 154,008 171,120 192,510 200,880 231,012 256,680 288,765 308,016 385,020 462,024 513,360 577,530 770,040 924,048 1,155,060 1,540,080 2,310,120 and 4,620,240, with no remainder.
Since 4,620,240 cannot be divided by just 1 and 4,620,240, it is not a prime number.