A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2953368 can be evenly divided by 1 2 3 4 6 8 9 11 12 18 22 24 27 33 36 44 54 66 72 88 99 108 113 121 132 198 216 226 242 264 297 339 363 396 452 484 594 678 726 792 904 968 1,017 1,089 1,188 1,243 1,356 1,452 2,034 2,178 2,376 2,486 2,712 2,904 3,051 3,267 3,729 4,068 4,356 4,972 6,102 6,534 7,458 8,136 8,712 9,944 11,187 12,204 13,068 13,673 14,916 22,374 24,408 26,136 27,346 29,832 33,561 41,019 44,748 54,692 67,122 82,038 89,496 109,384 123,057 134,244 164,076 246,114 268,488 328,152 369,171 492,228 738,342 984,456 1,476,684 and 2,953,368, with no remainder.
Since 2,953,368 cannot be divided by just 1 and 2,953,368, it is not a prime number.