A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5461456 can be evenly divided by 1 2 4 7 8 11 13 14 16 22 26 28 31 44 52 56 62 77 88 91 104 112 121 124 143 154 176 182 208 217 242 248 286 308 341 364 403 434 484 496 572 616 682 728 806 847 868 968 1,001 1,144 1,232 1,364 1,456 1,573 1,612 1,694 1,736 1,936 2,002 2,288 2,387 2,728 2,821 3,146 3,224 3,388 3,472 3,751 4,004 4,433 4,774 5,456 5,642 6,292 6,448 6,776 7,502 8,008 8,866 9,548 11,011 11,284 12,584 13,552 15,004 16,016 17,732 19,096 22,022 22,568 25,168 26,257 30,008 31,031 35,464 38,192 44,044 45,136 48,763 52,514 60,016 62,062 70,928 88,088 97,526 105,028 124,124 176,176 195,052 210,056 248,248 341,341 390,104 420,112 496,496 682,682 780,208 1,365,364 2,730,728 and 5,461,456, with no remainder.
Since 5,461,456 cannot be divided by just 1 and 5,461,456, it is not a prime number.