A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4506480 can be evenly divided by 1 2 3 4 5 6 8 9 10 11 12 15 16 18 20 22 24 30 33 36 40 44 45 48 55 60 66 72 80 88 90 99 110 120 132 144 165 176 180 198 220 240 264 330 360 396 440 495 528 569 660 720 792 880 990 1,138 1,320 1,584 1,707 1,980 2,276 2,640 2,845 3,414 3,960 4,552 5,121 5,690 6,259 6,828 7,920 8,535 9,104 10,242 11,380 12,518 13,656 17,070 18,777 20,484 22,760 25,036 25,605 27,312 31,295 34,140 37,554 40,968 45,520 50,072 51,210 56,331 62,590 68,280 75,108 81,936 93,885 100,144 102,420 112,662 125,180 136,560 150,216 187,770 204,840 225,324 250,360 281,655 300,432 375,540 409,680 450,648 500,720 563,310 751,080 901,296 1,126,620 1,502,160 2,253,240 and 4,506,480, with no remainder.
Since 4,506,480 cannot be divided by just 1 and 4,506,480, it is not a prime number.