A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2386692 can be evenly divided by 1 2 3 4 6 7 9 11 12 14 18 21 22 27 28 33 36 41 42 44 49 54 63 66 77 82 84 98 99 108 123 126 132 147 154 164 189 196 198 231 246 252 287 294 297 308 369 378 396 441 451 462 492 539 574 588 594 693 738 756 861 882 902 924 1,078 1,107 1,148 1,188 1,323 1,353 1,386 1,476 1,617 1,722 1,764 1,804 2,009 2,079 2,156 2,214 2,583 2,646 2,706 2,772 3,157 3,234 3,444 4,018 4,059 4,158 4,428 4,851 5,166 5,292 5,412 6,027 6,314 6,468 7,749 8,036 8,118 8,316 9,471 9,702 10,332 12,054 12,177 12,628 14,553 15,498 16,236 18,081 18,942 19,404 22,099 24,108 24,354 28,413 29,106 30,996 36,162 37,884 44,198 48,708 54,243 56,826 58,212 66,297 72,324 85,239 88,396 108,486 113,652 132,594 170,478 198,891 216,972 265,188 340,956 397,782 596,673 795,564 1,193,346 and 2,386,692, with no remainder.
Since 2,386,692 cannot be divided by just 1 and 2,386,692, it is not a prime number.