A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4337820 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 27 29 30 36 45 54 58 60 87 90 108 116 135 145 174 180 261 270 277 290 348 435 522 540 554 580 783 831 870 1,044 1,108 1,305 1,385 1,566 1,662 1,740 2,493 2,610 2,770 3,132 3,324 3,915 4,155 4,986 5,220 5,540 7,479 7,830 8,033 8,310 9,972 12,465 14,958 15,660 16,066 16,620 24,099 24,930 29,916 32,132 37,395 40,165 48,198 49,860 72,297 74,790 80,330 96,396 120,495 144,594 149,580 160,660 216,891 240,990 289,188 361,485 433,782 481,980 722,970 867,564 1,084,455 1,445,940 2,168,910 and 4,337,820, with no remainder.
Since 4,337,820 cannot be divided by just 1 and 4,337,820, it is not a prime number.