A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8464092 can be evenly divided by 1 2 3 4 6 7 12 13 14 21 23 26 28 39 42 46 52 69 78 84 91 92 138 156 161 182 273 276 299 322 337 364 483 546 598 644 674 897 966 1,011 1,092 1,196 1,348 1,794 1,932 2,022 2,093 2,359 3,588 4,044 4,186 4,381 4,718 6,279 7,077 7,751 8,372 8,762 9,436 12,558 13,143 14,154 15,502 17,524 23,253 25,116 26,286 28,308 30,667 31,004 46,506 52,572 54,257 61,334 92,001 93,012 100,763 108,514 122,668 162,771 184,002 201,526 217,028 302,289 325,542 368,004 403,052 604,578 651,084 705,341 1,209,156 1,410,682 2,116,023 2,821,364 4,232,046 and 8,464,092, with no remainder.
Since 8,464,092 cannot be divided by just 1 and 8,464,092, it is not a prime number.