A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7438080 can be evenly divided by 1 2 3 4 5 6 8 10 12 13 15 16 20 24 26 30 32 39 40 48 52 60 64 65 78 80 96 104 120 128 130 149 156 160 192 195 208 240 256 260 298 312 320 384 390 416 447 480 520 596 624 640 745 768 780 832 894 960 1,040 1,192 1,248 1,280 1,490 1,560 1,664 1,788 1,920 1,937 2,080 2,235 2,384 2,496 2,980 3,120 3,328 3,576 3,840 3,874 4,160 4,470 4,768 4,992 5,811 5,960 6,240 7,152 7,748 8,320 8,940 9,536 9,685 9,984 11,622 11,920 12,480 14,304 15,496 16,640 17,880 19,072 19,370 23,244 23,840 24,960 28,608 29,055 30,992 35,760 38,144 38,740 46,488 47,680 49,920 57,216 58,110 61,984 71,520 77,480 92,976 95,360 114,432 116,220 123,968 143,040 154,960 185,952 190,720 232,440 247,936 286,080 309,920 371,904 464,880 495,872 572,160 619,840 743,808 929,760 1,239,680 1,487,616 1,859,520 2,479,360 3,719,040 and 7,438,080, with no remainder.
Since 7,438,080 cannot be divided by just 1 and 7,438,080, it is not a prime number.