A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2296320 can be evenly divided by 1 2 3 4 5 6 8 10 12 13 15 16 20 23 24 26 30 32 39 40 46 48 52 60 64 65 69 78 80 92 96 104 115 120 128 130 138 156 160 184 192 195 208 230 240 256 260 276 299 312 320 345 368 384 390 416 460 480 512 520 552 598 624 640 690 736 768 780 832 897 920 960 1,040 1,104 1,196 1,248 1,280 1,380 1,472 1,495 1,536 1,560 1,664 1,794 1,840 1,920 2,080 2,208 2,392 2,496 2,560 2,760 2,944 2,990 3,120 3,328 3,588 3,680 3,840 4,160 4,416 4,485 4,784 4,992 5,520 5,888 5,980 6,240 6,656 7,176 7,360 7,680 8,320 8,832 8,970 9,568 9,984 11,040 11,776 11,960 12,480 14,352 14,720 16,640 17,664 17,940 19,136 19,968 22,080 23,920 24,960 28,704 29,440 33,280 35,328 35,880 38,272 44,160 47,840 49,920 57,408 58,880 71,760 76,544 88,320 95,680 99,840 114,816 143,520 153,088 176,640 191,360 229,632 287,040 382,720 459,264 574,080 765,440 1,148,160 and 2,296,320, with no remainder.
Since 2,296,320 cannot be divided by just 1 and 2,296,320, it is not a prime number.