A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3807804 can be evenly divided by 1 2 3 4 6 7 11 12 13 14 21 22 26 28 33 39 42 44 52 66 77 78 84 91 132 143 154 156 182 231 273 286 308 317 364 429 462 546 572 634 858 924 951 1,001 1,092 1,268 1,716 1,902 2,002 2,219 3,003 3,487 3,804 4,004 4,121 4,438 6,006 6,657 6,974 8,242 8,876 10,461 12,012 12,363 13,314 13,948 16,484 20,922 24,409 24,726 26,628 28,847 41,844 45,331 48,818 49,452 57,694 73,227 86,541 90,662 97,636 115,388 135,993 146,454 173,082 181,324 271,986 292,908 317,317 346,164 543,972 634,634 951,951 1,269,268 1,903,902 and 3,807,804, with no remainder.
Since 3,807,804 cannot be divided by just 1 and 3,807,804, it is not a prime number.