A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6039036 can be evenly divided by 1 2 3 4 6 9 12 18 19 27 36 38 54 57 76 81 108 109 114 162 171 218 228 243 324 327 342 436 486 513 654 684 729 972 981 1,026 1,308 1,458 1,539 1,962 2,052 2,071 2,916 2,943 3,078 3,924 4,142 4,617 5,886 6,156 6,213 8,284 8,829 9,234 11,772 12,426 13,851 17,658 18,468 18,639 24,852 26,487 27,702 35,316 37,278 52,974 55,404 55,917 74,556 79,461 105,948 111,834 158,922 167,751 223,668 317,844 335,502 503,253 671,004 1,006,506 1,509,759 2,013,012 3,019,518 and 6,039,036, with no remainder.
Since 6,039,036 cannot be divided by just 1 and 6,039,036, it is not a prime number.