A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7389480 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 19 20 21 24 28 30 35 38 40 42 56 57 60 70 76 84 95 105 114 120 133 140 152 168 190 210 228 266 280 285 380 399 420 456 463 532 570 665 760 798 840 926 1,064 1,140 1,330 1,389 1,596 1,852 1,995 2,280 2,315 2,660 2,778 3,192 3,241 3,704 3,990 4,630 5,320 5,556 6,482 6,945 7,980 8,797 9,260 9,723 11,112 12,964 13,890 15,960 16,205 17,594 18,520 19,446 25,928 26,391 27,780 32,410 35,188 38,892 43,985 48,615 52,782 55,560 61,579 64,820 70,376 77,784 87,970 97,230 105,564 123,158 129,640 131,955 175,940 184,737 194,460 211,128 246,316 263,910 307,895 351,880 369,474 388,920 492,632 527,820 615,790 738,948 923,685 1,055,640 1,231,580 1,477,896 1,847,370 2,463,160 3,694,740 and 7,389,480, with no remainder.
Since 7,389,480 cannot be divided by just 1 and 7,389,480, it is not a prime number.