A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 471960 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 19 20 23 24 27 30 36 38 40 45 46 54 57 60 69 72 76 90 92 95 108 114 115 120 135 138 152 171 180 184 190 207 216 228 230 270 276 285 342 345 360 380 414 437 456 460 513 540 552 570 621 684 690 760 828 855 874 920 1,026 1,035 1,080 1,140 1,242 1,311 1,368 1,380 1,656 1,710 1,748 2,052 2,070 2,185 2,280 2,484 2,565 2,622 2,760 3,105 3,420 3,496 3,933 4,104 4,140 4,370 4,968 5,130 5,244 6,210 6,555 6,840 7,866 8,280 8,740 10,260 10,488 11,799 12,420 13,110 15,732 17,480 19,665 20,520 23,598 24,840 26,220 31,464 39,330 47,196 52,440 58,995 78,660 94,392 117,990 157,320 235,980 and 471,960, with no remainder.
Since 471,960 cannot be divided by just 1 and 471,960, it is not a prime number.