A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4680000 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 13 15 16 18 20 24 25 26 30 32 36 39 40 45 48 50 52 60 64 65 72 75 78 80 90 96 100 104 117 120 125 130 144 150 156 160 180 192 195 200 208 225 234 240 250 260 288 300 312 320 325 360 375 390 400 416 450 468 480 500 520 576 585 600 624 625 650 720 750 780 800 832 900 936 960 975 1,000 1,040 1,125 1,170 1,200 1,248 1,250 1,300 1,440 1,500 1,560 1,600 1,625 1,800 1,872 1,875 1,950 2,000 2,080 2,250 2,340 2,400 2,496 2,500 2,600 2,880 2,925 3,000 3,120 3,250 3,600 3,744 3,750 3,900 4,000 4,160 4,500 4,680 4,800 4,875 5,000 5,200 5,625 5,850 6,000 6,240 6,500 7,200 7,488 7,500 7,800 8,000 8,125 9,000 9,360 9,750 10,000 10,400 11,250 11,700 12,000 12,480 13,000 14,400 14,625 15,000 15,600 16,250 18,000 18,720 19,500 20,000 20,800 22,500 23,400 24,000 24,375 26,000 29,250 30,000 31,200 32,500 36,000 37,440 39,000 40,000 45,000 46,800 48,750 52,000 58,500 60,000 62,400 65,000 72,000 73,125 78,000 90,000 93,600 97,500 104,000 117,000 120,000 130,000 146,250 156,000 180,000 187,200 195,000 234,000 260,000 292,500 312,000 360,000 390,000 468,000 520,000 585,000 780,000 936,000 1,170,000 1,560,000 2,340,000 and 4,680,000, with no remainder.
Since 4,680,000 cannot be divided by just 1 and 4,680,000, it is not a prime number.