A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5050920 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 20 21 24 28 30 35 40 42 49 56 60 70 84 98 105 120 140 147 168 196 210 245 280 294 392 420 490 588 735 840 859 980 1,176 1,470 1,718 1,960 2,577 2,940 3,436 4,295 5,154 5,880 6,013 6,872 8,590 10,308 12,026 12,885 17,180 18,039 20,616 24,052 25,770 30,065 34,360 36,078 42,091 48,104 51,540 60,130 72,156 84,182 90,195 103,080 120,260 126,273 144,312 168,364 180,390 210,455 240,520 252,546 336,728 360,780 420,910 505,092 631,365 721,560 841,820 1,010,184 1,262,730 1,683,640 2,525,460 and 5,050,920, with no remainder.
Since 5,050,920 cannot be divided by just 1 and 5,050,920, it is not a prime number.