A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5867136 can be evenly divided by 1 2 3 4 6 8 9 11 12 16 18 22 24 32 33 36 44 48 64 66 72 88 96 99 128 132 144 176 192 198 264 288 352 384 396 463 528 576 704 792 926 1,056 1,152 1,389 1,408 1,584 1,852 2,112 2,778 3,168 3,704 4,167 4,224 5,093 5,556 6,336 7,408 8,334 10,186 11,112 12,672 14,816 15,279 16,668 20,372 22,224 29,632 30,558 33,336 40,744 44,448 45,837 59,264 61,116 66,672 81,488 88,896 91,674 122,232 133,344 162,976 177,792 183,348 244,464 266,688 325,952 366,696 488,928 533,376 651,904 733,392 977,856 1,466,784 1,955,712 2,933,568 and 5,867,136, with no remainder.
Since 5,867,136 cannot be divided by just 1 and 5,867,136, it is not a prime number.