A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5972736 can be evenly divided by 1 2 3 4 6 7 8 11 12 14 16 21 22 24 28 32 33 42 44 48 56 64 66 77 84 88 96 101 112 128 132 154 168 176 192 202 224 231 256 264 303 308 336 352 384 404 448 462 528 606 616 672 704 707 768 808 896 924 1,056 1,111 1,212 1,232 1,344 1,408 1,414 1,616 1,792 1,848 2,112 2,121 2,222 2,424 2,464 2,688 2,816 2,828 3,232 3,333 3,696 4,224 4,242 4,444 4,848 4,928 5,376 5,656 6,464 6,666 7,392 7,777 8,448 8,484 8,888 9,696 9,856 11,312 12,928 13,332 14,784 15,554 16,968 17,776 19,392 19,712 22,624 23,331 25,856 26,664 29,568 31,108 33,936 35,552 38,784 45,248 46,662 53,328 59,136 62,216 67,872 71,104 77,568 90,496 93,324 106,656 124,432 135,744 142,208 180,992 186,648 213,312 248,864 271,488 284,416 373,296 426,624 497,728 542,976 746,592 853,248 995,456 1,493,184 1,990,912 2,986,368 and 5,972,736, with no remainder.
Since 5,972,736 cannot be divided by just 1 and 5,972,736, it is not a prime number.