A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8153496 can be evenly divided by 1 2 3 4 6 8 9 12 13 18 24 26 31 36 39 52 62 72 78 93 104 117 124 156 186 234 248 279 281 312 372 403 468 558 562 744 806 843 936 1,116 1,124 1,209 1,612 1,686 2,232 2,248 2,418 2,529 3,224 3,372 3,627 3,653 4,836 5,058 6,744 7,254 7,306 8,711 9,672 10,116 10,959 14,508 14,612 17,422 20,232 21,918 26,133 29,016 29,224 32,877 34,844 43,836 52,266 65,754 69,688 78,399 87,672 104,532 113,243 131,508 156,798 209,064 226,486 263,016 313,596 339,729 452,972 627,192 679,458 905,944 1,019,187 1,358,916 2,038,374 2,717,832 4,076,748 and 8,153,496, with no remainder.
Since 8,153,496 cannot be divided by just 1 and 8,153,496, it is not a prime number.