A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7196616 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 18 21 24 28 36 42 56 63 72 84 109 126 131 168 218 252 262 327 393 436 504 524 654 763 786 872 917 981 1,048 1,179 1,308 1,526 1,572 1,834 1,962 2,289 2,358 2,616 2,751 3,052 3,144 3,668 3,924 4,578 4,716 5,502 6,104 6,867 7,336 7,848 8,253 9,156 9,432 11,004 13,734 14,279 16,506 18,312 22,008 27,468 28,558 33,012 42,837 54,936 57,116 66,024 85,674 99,953 114,232 128,511 171,348 199,906 257,022 299,859 342,696 399,812 514,044 599,718 799,624 899,577 1,028,088 1,199,436 1,799,154 2,398,872 3,598,308 and 7,196,616, with no remainder.
Since 7,196,616 cannot be divided by just 1 and 7,196,616, it is not a prime number.