A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6965920 can be evenly divided by 1 2 4 5 8 10 13 16 17 20 26 32 34 40 52 65 68 80 85 104 130 136 160 170 197 208 221 260 272 340 394 416 442 520 544 680 788 884 985 1,040 1,105 1,360 1,576 1,768 1,970 2,080 2,210 2,561 2,720 3,152 3,349 3,536 3,940 4,420 5,122 6,304 6,698 7,072 7,880 8,840 10,244 12,805 13,396 15,760 16,745 17,680 20,488 25,610 26,792 31,520 33,490 35,360 40,976 43,537 51,220 53,584 66,980 81,952 87,074 102,440 107,168 133,960 174,148 204,880 217,685 267,920 348,296 409,760 435,370 535,840 696,592 870,740 1,393,184 1,741,480 3,482,960 and 6,965,920, with no remainder.
Since 6,965,920 cannot be divided by just 1 and 6,965,920, it is not a prime number.