A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4597320 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 13 14 15 20 21 24 26 28 30 35 39 40 42 52 56 60 65 70 78 84 91 104 105 120 130 140 156 168 182 195 210 260 273 280 312 364 390 420 421 455 520 546 728 780 840 842 910 1,092 1,263 1,365 1,560 1,684 1,820 2,105 2,184 2,526 2,730 2,947 3,368 3,640 4,210 5,052 5,460 5,473 5,894 6,315 8,420 8,841 10,104 10,920 10,946 11,788 12,630 14,735 16,419 16,840 17,682 21,892 23,576 25,260 27,365 29,470 32,838 35,364 38,311 43,784 44,205 50,520 54,730 58,940 65,676 70,728 76,622 82,095 88,410 109,460 114,933 117,880 131,352 153,244 164,190 176,820 191,555 218,920 229,866 306,488 328,380 353,640 383,110 459,732 574,665 656,760 766,220 919,464 1,149,330 1,532,440 2,298,660 and 4,597,320, with no remainder.
Since 4,597,320 cannot be divided by just 1 and 4,597,320, it is not a prime number.