A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6481170 can be evenly divided by 1 2 3 5 6 9 10 15 18 23 30 31 45 46 62 69 90 93 101 115 138 155 186 202 207 230 279 303 310 345 414 465 505 558 606 690 713 909 930 1,010 1,035 1,395 1,426 1,515 1,818 2,070 2,139 2,323 2,790 3,030 3,131 3,565 4,278 4,545 4,646 6,262 6,417 6,969 7,130 9,090 9,393 10,695 11,615 12,834 13,938 15,655 18,786 20,907 21,390 23,230 28,179 31,310 32,085 34,845 41,814 46,965 56,358 64,170 69,690 72,013 93,930 104,535 140,895 144,026 209,070 216,039 281,790 360,065 432,078 648,117 720,130 1,080,195 1,296,234 2,160,390 3,240,585 and 6,481,170, with no remainder.
Since 6,481,170 cannot be divided by just 1 and 6,481,170, it is not a prime number.