A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6137760 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 19 20 24 30 32 38 40 48 57 60 76 80 95 96 114 120 152 160 190 228 240 285 304 380 456 480 570 608 673 760 912 1,140 1,346 1,520 1,824 2,019 2,280 2,692 3,040 3,365 4,038 4,560 5,384 6,730 8,076 9,120 10,095 10,768 12,787 13,460 16,152 20,190 21,536 25,574 26,920 32,304 38,361 40,380 51,148 53,840 63,935 64,608 76,722 80,760 102,296 107,680 127,870 153,444 161,520 191,805 204,592 255,740 306,888 323,040 383,610 409,184 511,480 613,776 767,220 1,022,960 1,227,552 1,534,440 2,045,920 3,068,880 and 6,137,760, with no remainder.
Since 6,137,760 cannot be divided by just 1 and 6,137,760, it is not a prime number.