A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5238480 can be evenly divided by 1 2 3 4 5 6 8 10 12 13 15 16 20 23 24 26 30 39 40 46 48 52 60 65 69 73 78 80 92 104 115 120 130 138 146 156 184 195 208 219 230 240 260 276 292 299 312 345 365 368 390 438 460 520 552 584 598 624 690 730 780 876 897 920 949 1,040 1,095 1,104 1,168 1,196 1,380 1,460 1,495 1,560 1,679 1,752 1,794 1,840 1,898 2,190 2,392 2,760 2,847 2,920 2,990 3,120 3,358 3,504 3,588 3,796 4,380 4,485 4,745 4,784 5,037 5,520 5,694 5,840 5,980 6,716 7,176 7,592 8,395 8,760 8,970 9,490 10,074 11,388 11,960 13,432 14,235 14,352 15,184 16,790 17,520 17,940 18,980 20,148 21,827 22,776 23,920 25,185 26,864 28,470 33,580 35,880 37,960 40,296 43,654 45,552 50,370 56,940 65,481 67,160 71,760 75,920 80,592 87,308 100,740 109,135 113,880 130,962 134,320 174,616 201,480 218,270 227,760 261,924 327,405 349,232 402,960 436,540 523,848 654,810 873,080 1,047,696 1,309,620 1,746,160 2,619,240 and 5,238,480, with no remainder.
Since 5,238,480 cannot be divided by just 1 and 5,238,480, it is not a prime number.