A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4192776 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 18 21 24 27 28 36 42 47 54 56 59 63 72 84 94 108 118 126 141 168 177 188 189 216 236 252 282 329 354 376 378 413 423 472 504 531 564 658 708 756 826 846 987 1,062 1,128 1,239 1,269 1,316 1,416 1,512 1,593 1,652 1,692 1,974 2,124 2,478 2,538 2,632 2,773 2,961 3,186 3,304 3,384 3,717 3,948 4,248 4,956 5,076 5,546 5,922 6,372 7,434 7,896 8,319 8,883 9,912 10,152 11,092 11,151 11,844 12,744 14,868 16,638 17,766 19,411 22,184 22,302 23,688 24,957 29,736 33,276 35,532 38,822 44,604 49,914 58,233 66,552 71,064 74,871 77,644 89,208 99,828 116,466 149,742 155,288 174,699 199,656 232,932 299,484 349,398 465,864 524,097 598,968 698,796 1,048,194 1,397,592 2,096,388 and 4,192,776, with no remainder.
Since 4,192,776 cannot be divided by just 1 and 4,192,776, it is not a prime number.