A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8245848 can be evenly divided by 1 2 3 4 6 8 12 13 19 24 26 38 39 52 57 76 78 104 107 114 152 156 169 214 228 247 312 321 338 428 456 494 507 642 676 741 856 988 1,014 1,284 1,352 1,391 1,482 1,976 2,028 2,033 2,568 2,782 2,964 3,211 4,056 4,066 4,173 5,564 5,928 6,099 6,422 8,132 8,346 9,633 11,128 12,198 12,844 16,264 16,692 18,083 19,266 24,396 25,688 26,429 33,384 36,166 38,532 48,792 52,858 54,249 72,332 77,064 79,287 105,716 108,498 144,664 158,574 211,432 216,996 317,148 343,577 433,992 634,296 687,154 1,030,731 1,374,308 2,061,462 2,748,616 4,122,924 and 8,245,848, with no remainder.
Since 8,245,848 cannot be divided by just 1 and 8,245,848, it is not a prime number.