A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7141260 can be evenly divided by 1 2 3 4 5 6 7 10 12 14 15 20 21 28 30 35 42 49 60 70 84 98 105 140 147 196 210 245 294 343 347 420 490 588 686 694 735 980 1,029 1,041 1,372 1,388 1,470 1,715 1,735 2,058 2,082 2,429 2,940 3,430 3,470 4,116 4,164 4,858 5,145 5,205 6,860 6,940 7,287 9,716 10,290 10,410 12,145 14,574 17,003 20,580 20,820 24,290 29,148 34,006 36,435 48,580 51,009 68,012 72,870 85,015 102,018 119,021 145,740 170,030 204,036 238,042 255,045 340,060 357,063 476,084 510,090 595,105 714,126 1,020,180 1,190,210 1,428,252 1,785,315 2,380,420 3,570,630 and 7,141,260, with no remainder.
Since 7,141,260 cannot be divided by just 1 and 7,141,260, it is not a prime number.