A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 452760 can be evenly divided by 1 2 3 4 5 6 7 8 10 11 12 14 15 20 21 22 24 28 30 33 35 40 42 44 49 55 56 60 66 70 77 84 88 98 105 110 120 132 140 147 154 165 168 196 210 220 231 245 264 280 294 308 330 343 385 392 420 440 462 490 539 588 616 660 686 735 770 840 924 980 1,029 1,078 1,155 1,176 1,320 1,372 1,470 1,540 1,617 1,715 1,848 1,960 2,058 2,156 2,310 2,695 2,744 2,940 3,080 3,234 3,430 3,773 4,116 4,312 4,620 5,145 5,390 5,880 6,468 6,860 7,546 8,085 8,232 9,240 10,290 10,780 11,319 12,936 13,720 15,092 16,170 18,865 20,580 21,560 22,638 30,184 32,340 37,730 41,160 45,276 56,595 64,680 75,460 90,552 113,190 150,920 226,380 and 452,760, with no remainder.
Since 452,760 cannot be divided by just 1 and 452,760, it is not a prime number.