A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4598400 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 25 30 32 40 48 50 60 64 75 80 96 100 120 128 150 160 192 200 240 300 320 384 400 479 480 600 640 800 958 960 1,200 1,437 1,600 1,916 1,920 2,395 2,400 2,874 3,200 3,832 4,790 4,800 5,748 7,185 7,664 9,580 9,600 11,496 11,975 14,370 15,328 19,160 22,992 23,950 28,740 30,656 35,925 38,320 45,984 47,900 57,480 61,312 71,850 76,640 91,968 95,800 114,960 143,700 153,280 183,936 191,600 229,920 287,400 306,560 383,200 459,840 574,800 766,400 919,680 1,149,600 1,532,800 2,299,200 and 4,598,400, with no remainder.
Since 4,598,400 cannot be divided by just 1 and 4,598,400, it is not a prime number.