A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6329088 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 24 32 36 41 48 64 67 72 82 96 123 128 134 144 164 192 201 246 256 268 288 328 369 384 402 492 536 576 603 656 738 768 804 984 1,072 1,152 1,206 1,312 1,476 1,608 1,968 2,144 2,304 2,412 2,624 2,747 2,952 3,216 3,936 4,288 4,824 5,248 5,494 5,904 6,432 7,872 8,241 8,576 9,648 10,496 10,988 11,808 12,864 15,744 16,482 17,152 19,296 21,976 23,616 24,723 25,728 31,488 32,964 38,592 43,952 47,232 49,446 51,456 65,928 77,184 87,904 94,464 98,892 131,856 154,368 175,808 197,784 263,712 351,616 395,568 527,424 703,232 791,136 1,054,848 1,582,272 2,109,696 3,164,544 and 6,329,088, with no remainder.
Since 6,329,088 cannot be divided by just 1 and 6,329,088, it is not a prime number.