There are some perfect square numbers whose last three digits are all the same and not 0. What is the smallest of these numbers?
有一些完全平方数的最后三位数码都相同且不为0，请问这些数中最小的是什么？
<gadget id="calculator">38 * 38</gadget>
<output>1_444</output>

<result>1_444</result>