## IsPrime

Keywords: ASP VBScript Math Functions
Tags: ASP Scripting VBScript Windows
Views: 1971

This handy little vbscript function checks to see if a number is a primary number.

Prime numbers are commonly found in encryption schemes that use Public/Private keys.

Pass it a number, and it will return a true/false value depending on the "primeness" of the number.

It first assumes that the number passed is false. Then it simply checks if it is less than 2, divisible by two, or has a square.

If it makes it past those checks, then it must be prime. The value is set and returned to the caller.

`'**************************************' Name: IsPrime' Description:Checks to see if a number is a primary number. Prime numbers are commonly found in encryption schemes that use Public/Private keys.'************************************** function IsPrime(ByRef pLngNumber)Dim lLngSquareDim lLngIndexIsPrime = Falseif pLngNumber < 2 Then Exit functionif pLngNumber Mod 2 = 0 Then Exit functionlLngSquare = Sqr(pLngNumber)For lLngIndex = 3 To lLngSquare Step 2if pLngNumber Mod lLngIndex = 0 Then Exit functionNextIsPrime = TrueEnd function`

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