A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5197260 can be evenly divided by 1 2 3 4 5 6 10 12 15 19 20 30 38 47 57 60 76 94 95 97 114 141 188 190 194 228 235 282 285 291 380 388 470 485 564 570 582 705 893 940 970 1,140 1,164 1,410 1,455 1,786 1,843 1,940 2,679 2,820 2,910 3,572 3,686 4,465 4,559 5,358 5,529 5,820 7,372 8,930 9,118 9,215 10,716 11,058 13,395 13,677 17,860 18,236 18,430 22,116 22,795 26,790 27,354 27,645 36,860 45,590 53,580 54,708 55,290 68,385 86,621 91,180 110,580 136,770 173,242 259,863 273,540 346,484 433,105 519,726 866,210 1,039,452 1,299,315 1,732,420 2,598,630 and 5,197,260, with no remainder.
Since 5,197,260 cannot be divided by just 1 and 5,197,260, it is not a prime number.