A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6769400 can be evenly divided by 1 2 4 5 8 10 11 17 20 22 25 34 40 44 50 55 68 85 88 100 110 136 170 181 187 200 220 275 340 362 374 425 440 550 680 724 748 850 905 935 1,100 1,448 1,496 1,700 1,810 1,870 1,991 2,200 3,077 3,400 3,620 3,740 3,982 4,525 4,675 6,154 7,240 7,480 7,964 9,050 9,350 9,955 12,308 15,385 15,928 18,100 18,700 19,910 24,616 30,770 33,847 36,200 37,400 39,820 49,775 61,540 67,694 76,925 79,640 99,550 123,080 135,388 153,850 169,235 199,100 270,776 307,700 338,470 398,200 615,400 676,940 846,175 1,353,880 1,692,350 3,384,700 and 6,769,400, with no remainder.
Since 6,769,400 cannot be divided by just 1 and 6,769,400, it is not a prime number.