A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3568968 can be evenly divided by 1 2 3 4 6 8 9 12 13 18 24 26 27 31 36 39 41 52 54 62 72 78 82 93 104 108 117 123 124 156 164 186 216 234 246 248 279 312 328 351 369 372 403 468 492 533 558 702 738 744 806 837 936 984 1,066 1,107 1,116 1,209 1,271 1,404 1,476 1,599 1,612 1,674 2,132 2,214 2,232 2,418 2,542 2,808 2,952 3,198 3,224 3,348 3,627 3,813 4,264 4,428 4,797 4,836 5,084 6,396 6,696 7,254 7,626 8,856 9,594 9,672 10,168 10,881 11,439 12,792 14,391 14,508 15,252 16,523 19,188 21,762 22,878 28,782 29,016 30,504 33,046 34,317 38,376 43,524 45,756 49,569 57,564 66,092 68,634 87,048 91,512 99,138 115,128 132,184 137,268 148,707 198,276 274,536 297,414 396,552 446,121 594,828 892,242 1,189,656 1,784,484 and 3,568,968, with no remainder.
Since 3,568,968 cannot be divided by just 1 and 3,568,968, it is not a prime number.