A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4656600 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 13 15 18 20 24 25 26 30 36 39 40 45 50 52 60 65 72 75 78 90 100 104 117 120 130 150 156 180 195 199 200 225 234 260 300 312 325 360 390 398 450 468 520 585 597 600 650 780 796 900 936 975 995 1,170 1,194 1,300 1,560 1,592 1,791 1,800 1,950 1,990 2,340 2,388 2,587 2,600 2,925 2,985 3,582 3,900 3,980 4,680 4,776 4,975 5,174 5,850 5,970 7,164 7,761 7,800 7,960 8,955 9,950 10,348 11,700 11,940 12,935 14,328 14,925 15,522 17,910 19,900 20,696 23,283 23,400 23,880 25,870 29,850 31,044 35,820 38,805 39,800 44,775 46,566 51,740 59,700 62,088 64,675 71,640 77,610 89,550 93,132 103,480 116,415 119,400 129,350 155,220 179,100 186,264 194,025 232,830 258,700 310,440 358,200 388,050 465,660 517,400 582,075 776,100 931,320 1,164,150 1,552,200 2,328,300 and 4,656,600, with no remainder.
Since 4,656,600 cannot be divided by just 1 and 4,656,600, it is not a prime number.