1为什么既不是质数也不是合数

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select * from tbl_Articles WHERE ArticleID=2883533 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2883533 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2883533 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1072093,1074538,1055149,1128131,1070732,1130212,1070038,1072591,1125632,1075648,1065259,3215191,1104045,1071749,1061796,994629,1053308,1056160,1126216,998502,1049946,1042847,1835959,1067933,1072721,1127819,1068154,1056152,1087115,1050369) ORDER BY field (ArticleID,1072093,1074538,1055149,1128131,1070732,1130212,1070038,1072591,1125632,1075648,1065259,3215191,1104045,1071749,1061796,994629,1053308,1056160,1126216,998502,1049946,1042847,1835959,1067933,1072721,1127819,1068154,1056152,1087115,1050369)