A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2852280 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 19 20 24 27 30 36 38 40 45 54 57 60 72 76 90 95 108 114 120 135 139 152 171 180 190 216 228 270 278 285 342 360 380 417 456 513 540 556 570 684 695 760 834 855 1,026 1,080 1,112 1,140 1,251 1,368 1,390 1,668 1,710 2,052 2,085 2,280 2,502 2,565 2,641 2,780 3,336 3,420 3,753 4,104 4,170 5,004 5,130 5,282 5,560 6,255 6,840 7,506 7,923 8,340 10,008 10,260 10,564 12,510 13,205 15,012 15,846 16,680 18,765 20,520 21,128 23,769 25,020 26,410 30,024 31,692 37,530 39,615 47,538 50,040 52,820 63,384 71,307 75,060 79,230 95,076 105,640 118,845 142,614 150,120 158,460 190,152 237,690 285,228 316,920 356,535 475,380 570,456 713,070 950,760 1,426,140 and 2,852,280, with no remainder.
Since 2,852,280 cannot be divided by just 1 and 2,852,280, it is not a prime number.