A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6113664 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 24 27 29 32 36 48 54 58 61 64 72 87 96 108 116 122 128 144 174 183 192 216 232 244 261 288 348 366 384 432 464 488 522 549 576 696 732 783 864 928 976 1,044 1,098 1,152 1,392 1,464 1,566 1,647 1,728 1,769 1,856 1,952 2,088 2,196 2,784 2,928 3,132 3,294 3,456 3,538 3,712 3,904 4,176 4,392 5,307 5,568 5,856 6,264 6,588 7,076 7,808 8,352 8,784 10,614 11,136 11,712 12,528 13,176 14,152 15,921 16,704 17,568 21,228 23,424 25,056 26,352 28,304 31,842 33,408 35,136 42,456 47,763 50,112 52,704 56,608 63,684 70,272 84,912 95,526 100,224 105,408 113,216 127,368 169,824 191,052 210,816 226,432 254,736 339,648 382,104 509,472 679,296 764,208 1,018,944 1,528,416 2,037,888 3,056,832 and 6,113,664, with no remainder.
Since 6,113,664 cannot be divided by just 1 and 6,113,664, it is not a prime number.