Xsharp prime number tester

gistfile1.xml

<xsharp> 
   <set var='isPrime'><true/></set>
    <set var='i'><int>3</int></set>
    <set var='root'>
       <call class='Math' method='Sqrt'>
          <get var='numberToTest'/>
       </call>
   </set>
    <while>
        <and>
            <get var='isPrime'/>
            <less-than-or-equal><get var='i'/><get var='numberToTest'/></less-than-or-equal>
        </and>
        <if>
            <equals><int>0</int><mod><get var='numberToTest'/><get var='i'/></mod></equals>
            <set var='isPrime'><false/></set>
        </if>
        <set var='i'><add><get var='i'/><int>2</int></add></set>
    </while>
    <call class='System.Console' method='Write'>
        <get var='numberToTest'/>
    </call>
    <call class='System.Console' method='WriteLine'>
        <if>
            <get var='isPrime'/>
            <string> is prime</string>
            <else>
                <string> is not prime</string>    
            </else>
        </if>
    </call>
</xsharp>