A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8179164 can be evenly divided by 1 2 3 4 6 7 9 12 14 18 21 27 28 31 36 42 54 62 63 84 93 108 124 126 186 189 217 252 279 349 372 378 434 558 651 698 756 837 868 1,047 1,116 1,302 1,396 1,674 1,953 2,094 2,443 2,604 3,141 3,348 3,906 4,188 4,886 5,859 6,282 7,329 7,812 9,423 9,772 10,819 11,718 12,564 14,658 18,846 21,638 21,987 23,436 29,316 32,457 37,692 43,276 43,974 64,914 65,961 75,733 87,948 97,371 129,828 131,922 151,466 194,742 227,199 263,844 292,113 302,932 389,484 454,398 584,226 681,597 908,796 1,168,452 1,363,194 2,044,791 2,726,388 4,089,582 and 8,179,164, with no remainder.
Since 8,179,164 cannot be divided by just 1 and 8,179,164, it is not a prime number.