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leetcode-problemset/leetcode-cn/problem (Chinese)/三除数 [three-divisors].html
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<p>给你一个整数 <code>n</code> 。如果 <code>n</code> <strong>恰好有三个正除数</strong> ,返回 <code>true</code><em> </em>;否则,返回<em> </em><code>false</code></p>
<p>如果存在整数 <code>k</code> ,满足 <code>n = k * m</code> ,那么整数 <code>m</code> 就是 <code>n</code> 的一个 <strong>除数</strong></p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<pre><strong>输入:</strong>n = 2
<strong>输出:</strong>false
<strong>解释:</strong>2 只有两个除数1 和 2 。</pre>
<p><strong>示例 2</strong></p>
<pre><strong>输入:</strong>n = 4
<strong>输出:</strong>true
<strong>解释:</strong>4 有三个除数1、2 和 4 。
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 &lt;= n &lt;= 10<sup>4</sup></code></li>
</ul>