A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2952768 can be evenly divided by 1 2 3 4 6 7 8 12 13 14 16 21 24 26 28 32 39 42 48 52 56 64 78 84 91 96 104 112 156 168 169 182 192 208 224 273 312 336 338 364 416 448 507 546 624 672 676 728 832 1,014 1,092 1,183 1,248 1,344 1,352 1,456 2,028 2,184 2,197 2,366 2,496 2,704 2,912 3,549 4,056 4,368 4,394 4,732 5,408 5,824 6,591 7,098 8,112 8,736 8,788 9,464 10,816 13,182 14,196 15,379 16,224 17,472 17,576 18,928 26,364 28,392 30,758 32,448 35,152 37,856 46,137 52,728 56,784 61,516 70,304 75,712 92,274 105,456 113,568 123,032 140,608 184,548 210,912 227,136 246,064 369,096 421,824 492,128 738,192 984,256 1,476,384 and 2,952,768, with no remainder.
Since 2,952,768 cannot be divided by just 1 and 2,952,768, it is not a prime number.