A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3325608 can be evenly divided by 1 2 3 4 6 8 9 11 12 13 17 18 19 22 24 26 33 34 36 38 39 44 51 52 57 66 68 72 76 78 88 99 102 104 114 117 132 136 143 152 153 156 171 187 198 204 209 221 228 234 247 264 286 306 312 323 342 374 396 408 418 429 442 456 468 494 561 572 612 627 646 663 684 741 748 792 836 858 884 936 969 988 1,122 1,144 1,224 1,254 1,287 1,292 1,326 1,368 1,482 1,496 1,672 1,683 1,716 1,768 1,881 1,938 1,976 1,989 2,223 2,244 2,431 2,508 2,574 2,584 2,652 2,717 2,907 2,964 3,366 3,432 3,553 3,762 3,876 3,978 4,199 4,446 4,488 4,862 5,016 5,148 5,304 5,434 5,814 5,928 6,732 7,106 7,293 7,524 7,752 7,956 8,151 8,398 8,892 9,724 10,296 10,659 10,868 11,628 12,597 13,464 14,212 14,586 15,048 15,912 16,302 16,796 17,784 19,448 21,318 21,736 21,879 23,256 24,453 25,194 28,424 29,172 31,977 32,604 33,592 37,791 42,636 43,758 46,189 48,906 50,388 58,344 63,954 65,208 75,582 85,272 87,516 92,378 97,812 100,776 127,908 138,567 151,164 175,032 184,756 195,624 255,816 277,134 302,328 369,512 415,701 554,268 831,402 1,108,536 1,662,804 and 3,325,608, with no remainder.
Since 3,325,608 cannot be divided by just 1 and 3,325,608, it is not a prime number.