A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8020008 can be evenly divided by 1 2 3 4 6 8 9 12 18 23 24 29 36 46 58 69 72 87 92 116 138 167 174 184 207 232 261 276 334 348 414 501 522 552 667 668 696 828 1,002 1,044 1,334 1,336 1,503 1,656 2,001 2,004 2,088 2,668 3,006 3,841 4,002 4,008 4,843 5,336 6,003 6,012 7,682 8,004 9,686 11,523 12,006 12,024 14,529 15,364 16,008 19,372 23,046 24,012 29,058 30,728 34,569 38,744 43,587 46,092 48,024 58,116 69,138 87,174 92,184 111,389 116,232 138,276 174,348 222,778 276,552 334,167 348,696 445,556 668,334 891,112 1,002,501 1,336,668 2,005,002 2,673,336 4,010,004 and 8,020,008, with no remainder.
Since 8,020,008 cannot be divided by just 1 and 8,020,008, it is not a prime number.