A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5200440 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 20 21 24 28 30 35 40 41 42 56 60 70 82 84 105 120 123 140 151 164 168 205 210 246 280 287 302 328 410 420 453 492 574 604 615 755 820 840 861 906 984 1,057 1,148 1,208 1,230 1,435 1,510 1,640 1,722 1,812 2,114 2,265 2,296 2,460 2,870 3,020 3,171 3,444 3,624 4,228 4,305 4,530 4,920 5,285 5,740 6,040 6,191 6,342 6,888 8,456 8,610 9,060 10,570 11,480 12,382 12,684 15,855 17,220 18,120 18,573 21,140 24,764 25,368 30,955 31,710 34,440 37,146 42,280 43,337 49,528 61,910 63,420 74,292 86,674 92,865 123,820 126,840 130,011 148,584 173,348 185,730 216,685 247,640 260,022 346,696 371,460 433,370 520,044 650,055 742,920 866,740 1,040,088 1,300,110 1,733,480 2,600,220 and 5,200,440, with no remainder.
Since 5,200,440 cannot be divided by just 1 and 5,200,440, it is not a prime number.