A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4450680 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 13 15 18 20 24 26 27 30 36 39 40 45 52 54 60 65 72 78 90 104 108 117 120 130 135 156 180 195 216 234 260 270 312 317 351 360 390 468 520 540 585 634 702 780 936 951 1,080 1,170 1,268 1,404 1,560 1,585 1,755 1,902 2,340 2,536 2,808 2,853 3,170 3,510 3,804 4,121 4,680 4,755 5,706 6,340 7,020 7,608 8,242 8,559 9,510 11,412 12,363 12,680 14,040 14,265 16,484 17,118 19,020 20,605 22,824 24,726 28,530 32,968 34,236 37,089 38,040 41,210 42,795 49,452 57,060 61,815 68,472 74,178 82,420 85,590 98,904 111,267 114,120 123,630 148,356 164,840 171,180 185,445 222,534 247,260 296,712 342,360 370,890 445,068 494,520 556,335 741,780 890,136 1,112,670 1,483,560 2,225,340 and 4,450,680, with no remainder.
Since 4,450,680 cannot be divided by just 1 and 4,450,680, it is not a prime number.