tml#TYPEbig_int">big_int</a> -&gt; <a href="Big_int.html#TYPEbig_int">big_int</a></code></pre><div class="info ">
<code class="code">sqrt_big_int a</code> returns the integer square root of <code class="code">a</code>,
           that is, the largest big integer <code class="code">r</code> such that <code class="code">r * r &lt;= a</code>.
           Raise <code class="code"><span class="constructor">Invalid_argument</span></code> if <code class="code">a</code> is negative.<br>
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