A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4247496 can be evenly divided by 1 2 3 4 6 8 9 11 12 18 22 24 31 33 36 44 62 66 72 88 93 99 124 132 173 186 198 248 264 279 341 346 372 396 519 558 682 692 744 792 1,023 1,038 1,116 1,364 1,384 1,557 1,903 2,046 2,076 2,232 2,728 3,069 3,114 3,806 4,092 4,152 5,363 5,709 6,138 6,228 7,612 8,184 10,726 11,418 12,276 12,456 15,224 16,089 17,127 21,452 22,836 24,552 32,178 34,254 42,904 45,672 48,267 58,993 64,356 68,508 96,534 117,986 128,712 137,016 176,979 193,068 235,972 353,958 386,136 471,944 530,937 707,916 1,061,874 1,415,832 2,123,748 and 4,247,496, with no remainder.
Since 4,247,496 cannot be divided by just 1 and 4,247,496, it is not a prime number.