A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4204620 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 28 30 35 36 42 45 47 60 63 70 71 84 90 94 105 126 140 141 142 180 188 210 213 235 252 282 284 315 329 355 420 423 426 470 497 564 630 639 658 705 710 846 852 940 987 994 1,065 1,260 1,278 1,316 1,410 1,420 1,491 1,645 1,692 1,974 1,988 2,115 2,130 2,485 2,556 2,820 2,961 2,982 3,195 3,290 3,337 3,948 4,230 4,260 4,473 4,935 4,970 5,922 5,964 6,390 6,580 6,674 7,455 8,460 8,946 9,870 9,940 10,011 11,844 12,780 13,348 14,805 14,910 16,685 17,892 19,740 20,022 22,365 23,359 29,610 29,820 30,033 33,370 40,044 44,730 46,718 50,055 59,220 60,066 66,740 70,077 89,460 93,436 100,110 116,795 120,132 140,154 150,165 200,220 210,231 233,590 280,308 300,330 350,385 420,462 467,180 600,660 700,770 840,924 1,051,155 1,401,540 2,102,310 and 4,204,620, with no remainder.
Since 4,204,620 cannot be divided by just 1 and 4,204,620, it is not a prime number.