A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4230000 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 25 30 36 40 45 47 48 50 60 72 75 80 90 94 100 120 125 141 144 150 180 188 200 225 235 240 250 282 300 360 375 376 400 423 450 470 500 564 600 625 705 720 750 752 846 900 940 1,000 1,125 1,128 1,175 1,200 1,250 1,410 1,500 1,692 1,800 1,875 1,880 2,000 2,115 2,250 2,256 2,350 2,500 2,820 3,000 3,384 3,525 3,600 3,750 3,760 4,230 4,500 4,700 5,000 5,625 5,640 5,875 6,000 6,768 7,050 7,500 8,460 9,000 9,400 10,000 10,575 11,250 11,280 11,750 14,100 15,000 16,920 17,625 18,000 18,800 21,150 22,500 23,500 28,200 29,375 30,000 33,840 35,250 42,300 45,000 47,000 52,875 56,400 58,750 70,500 84,600 88,125 90,000 94,000 105,750 117,500 141,000 169,200 176,250 211,500 235,000 264,375 282,000 352,500 423,000 470,000 528,750 705,000 846,000 1,057,500 1,410,000 2,115,000 and 4,230,000, with no remainder.
Since 4,230,000 cannot be divided by just 1 and 4,230,000, it is not a prime number.