A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1471860 can be evenly divided by 1 2 3 4 5 6 9 10 12 13 15 17 18 20 26 30 34 36 37 39 45 51 52 60 65 68 74 78 85 90 102 111 117 130 148 153 156 170 180 185 195 204 221 222 234 255 260 306 333 340 370 390 442 444 468 481 510 555 585 612 629 663 666 740 765 780 884 962 1,020 1,105 1,110 1,170 1,258 1,326 1,332 1,443 1,530 1,665 1,887 1,924 1,989 2,210 2,220 2,340 2,405 2,516 2,652 2,886 3,060 3,145 3,315 3,330 3,774 3,978 4,329 4,420 4,810 5,661 5,772 6,290 6,630 6,660 7,215 7,548 7,956 8,177 8,658 9,435 9,620 9,945 11,322 12,580 13,260 14,430 16,354 17,316 18,870 19,890 21,645 22,644 24,531 28,305 28,860 32,708 37,740 39,780 40,885 43,290 49,062 56,610 73,593 81,770 86,580 98,124 113,220 122,655 147,186 163,540 245,310 294,372 367,965 490,620 735,930 and 1,471,860, with no remainder.
Since 1,471,860 cannot be divided by just 1 and 1,471,860, it is not a prime number.