什么是质数和合数

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select * from tbl_Articles WHERE ArticleID=1008286 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1008286 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1008286 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1113882,1135727,1111360,1111804,509824,1100054,1091029,1016019,1026024,619427,1539363,1112316,1095414,508100,1117929,620710,1089002,923269,1099323,1108951,1113686,1071288,827838,1082483,680687,1118442,779153,1195155,455729,1125726) ORDER BY field (ArticleID,1113882,1135727,1111360,1111804,509824,1100054,1091029,1016019,1026024,619427,1539363,1112316,1095414,508100,1117929,620710,1089002,923269,1099323,1108951,1113686,1071288,827838,1082483,680687,1118442,779153,1195155,455729,1125726)