A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5772888 can be evenly divided by 1 2 3 4 6 8 9 11 12 18 22 24 33 36 37 44 66 72 74 88 99 111 132 148 197 198 222 264 296 333 394 396 407 444 591 666 788 792 814 888 1,182 1,221 1,332 1,576 1,628 1,773 2,167 2,364 2,442 2,664 3,256 3,546 3,663 4,334 4,728 4,884 6,501 7,092 7,289 7,326 8,668 9,768 13,002 14,184 14,578 14,652 17,336 19,503 21,867 26,004 29,156 29,304 39,006 43,734 52,008 58,312 65,601 78,012 80,179 87,468 131,202 156,024 160,358 174,936 240,537 262,404 320,716 481,074 524,808 641,432 721,611 962,148 1,443,222 1,924,296 2,886,444 and 5,772,888, with no remainder.
Since 5,772,888 cannot be divided by just 1 and 5,772,888, it is not a prime number.