A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6021600 can be evenly divided by 1 2 3 4 5 6 8 10 12 13 15 16 20 24 25 26 30 32 39 40 48 50 52 60 65 75 78 80 96 100 104 120 130 150 156 160 193 195 200 208 240 260 300 312 325 386 390 400 416 480 520 579 600 624 650 772 780 800 965 975 1,040 1,158 1,200 1,248 1,300 1,544 1,560 1,930 1,950 2,080 2,316 2,400 2,509 2,600 2,895 3,088 3,120 3,860 3,900 4,632 4,825 5,018 5,200 5,790 6,176 6,240 7,527 7,720 7,800 9,264 9,650 10,036 10,400 11,580 12,545 14,475 15,054 15,440 15,600 18,528 19,300 20,072 23,160 25,090 28,950 30,108 30,880 31,200 37,635 38,600 40,144 46,320 50,180 57,900 60,216 62,725 75,270 77,200 80,288 92,640 100,360 115,800 120,432 125,450 150,540 154,400 188,175 200,720 231,600 240,864 250,900 301,080 376,350 401,440 463,200 501,800 602,160 752,700 1,003,600 1,204,320 1,505,400 2,007,200 3,010,800 and 6,021,600, with no remainder.
Since 6,021,600 cannot be divided by just 1 and 6,021,600, it is not a prime number.