The four-digit number \overline{abcd} is a multiple of 22, and b+c=a, \overline{bc} is a perfect square number, find the four-digit number.
四位数\overline{abcd}是22的倍数，且b+c=a，\overline{bc}为完全平方数，求这个四位数．
<result>9_812</result>