Question

（2008?射洪縣）兩個質(zhì)數(shù)的積一定不是（　�。�

A．奇數(shù)

B．偶數(shù)

C．質(zhì)數(shù)

D．合數(shù)

Answer 1

分析：判斷一個數(shù)是奇數(shù)還是偶數(shù)看這個數(shù)能否被2整除，判斷一個數(shù)是質(zhì)數(shù)還是合數(shù)看這個數(shù)約數(shù)個數(shù)的多少，據(jù)此解答即可．

解答：解：2是最小的質(zhì)數(shù)，2×3=6，6是偶數(shù)也是合數(shù)，由此排除B、D，3×5=15，15是奇數(shù)也是合數(shù)，由此排除A、D．．
答：兩個質(zhì)數(shù)的積一定不是質(zhì)數(shù)．
故此題選擇C

點評：考查目的：①奇數(shù)與偶數(shù)、質(zhì)數(shù)與合數(shù)的定義．②奇數(shù)與質(zhì)數(shù)、偶數(shù)與合數(shù)的區(qū)別．