# IsPrime()

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A simple math function I did for my sisters homework.

```Func IsPrime(\$io_number)
Local \$Num
\$Num = Abs(\$io_number)
If \$Num < 2 And \$Num > -2 Then Return 1
For \$a = 2 To Int((\$Num / 2) + 1)
If Mod(\$Num, \$a) = 0 Then Return 0
Next
Return 1
EndFunc   ;==>IsPrime```

-James

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A simple math function I did for my sisters homework.

```Func IsPrime(\$io_number)
Local \$Num
\$Num = Abs(\$io_number)
If \$Num < 2 And \$Num > -2 Then Return 1
For \$a = 2 To Int((\$Num / 2) + 1)
If Mod(\$Num, \$a) = 0 Then Return 0
Next
Return 1
EndFunc   ;==>IsPrime```

-James

For big numbers this will probably be quite slow, so you could save some time by ignoring even numbers after 2

```Func IsPrime(\$io_number)
Local \$Num
\$Num = Abs(\$io_number)
If \$Num < 2 And \$Num > -2 Then Return 1

If Mod(\$Num, 2) = 0 Then Return 0

For \$a = 3 To Int((\$Num / 2) + 1) Step 2
If Mod(\$Num, \$a) = 0 Then Return 0
Next
Return 1
EndFunc  ;==>IsPrime```

Not tried it though!

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Nice

I just followed an equation I found somewhere.

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