A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7884492 can be evenly divided by 1 2 3 4 6 7 11 12 14 21 22 23 28 33 42 44 46 49 53 66 69 77 84 92 98 106 132 138 147 154 159 161 196 212 231 253 276 294 308 318 322 371 462 483 506 539 583 588 636 644 742 759 924 966 1,012 1,078 1,113 1,127 1,166 1,219 1,484 1,518 1,617 1,749 1,771 1,932 2,156 2,226 2,254 2,332 2,438 2,597 3,036 3,234 3,381 3,498 3,542 3,657 4,081 4,452 4,508 4,876 5,194 5,313 6,468 6,762 6,996 7,084 7,314 7,791 8,162 8,533 10,388 10,626 12,243 12,397 13,409 13,524 14,628 15,582 16,324 17,066 21,252 24,486 24,794 25,599 26,818 28,567 31,164 34,132 37,191 40,227 48,972 49,588 51,198 53,636 57,134 59,731 74,382 80,454 85,701 93,863 102,396 114,268 119,462 148,764 160,908 171,402 179,193 187,726 238,924 281,589 342,804 358,386 375,452 563,178 657,041 716,772 1,126,356 1,314,082 1,971,123 2,628,164 3,942,246 and 7,884,492, with no remainder.
Since 7,884,492 cannot be divided by just 1 and 7,884,492, it is not a prime number.