A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4443552 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 24 27 32 36 37 48 54 72 74 96 108 111 139 144 148 216 222 278 288 296 333 417 432 444 556 592 666 834 864 888 999 1,112 1,184 1,251 1,332 1,668 1,776 1,998 2,224 2,502 2,664 3,336 3,552 3,753 3,996 4,448 5,004 5,143 5,328 6,672 7,506 7,992 10,008 10,286 10,656 13,344 15,012 15,429 15,984 20,016 20,572 30,024 30,858 31,968 40,032 41,144 46,287 60,048 61,716 82,288 92,574 120,096 123,432 138,861 164,576 185,148 246,864 277,722 370,296 493,728 555,444 740,592 1,110,888 1,481,184 2,221,776 and 4,443,552, with no remainder.
Since 4,443,552 cannot be divided by just 1 and 4,443,552, it is not a prime number.