Dim a As Integer
Dim b As Integer
Dim number As String
number = InputBox("输入数字")
a = number
Dim Flag As Boolean
Flag = True
For b = 2 To Sqr(a)
'不用判断到a-1,只要到 Sqr(A)就OK了
If a Mod b = 0 Then
Flag = False
Exit For
End If
Next
If Flag = True Then
Print "是质数"
Else
Print "不是质数"
End If
