A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5443900 can be evenly divided by 1 2 4 5 7 10 11 14 20 22 25 28 35 44 49 50 55 70 77 98 100 101 110 140 154 175 196 202 220 245 275 308 350 385 404 490 505 539 550 700 707 770 980 1,010 1,078 1,100 1,111 1,225 1,414 1,540 1,925 2,020 2,156 2,222 2,450 2,525 2,695 2,828 3,535 3,850 4,444 4,900 4,949 5,050 5,390 5,555 7,070 7,700 7,777 9,898 10,100 10,780 11,110 13,475 14,140 15,554 17,675 19,796 22,220 24,745 26,950 27,775 31,108 35,350 38,885 49,490 53,900 54,439 55,550 70,700 77,770 98,980 108,878 111,100 123,725 155,540 194,425 217,756 247,450 272,195 388,850 494,900 544,390 777,700 1,088,780 1,360,975 2,721,950 and 5,443,900, with no remainder.
Since 5,443,900 cannot be divided by just 1 and 5,443,900, it is not a prime number.