diff --git a/programmers/정수 제곱근 판별/solution.java b/programmers/정수 제곱근 판별/solution.java
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index 0000000..0c629b9
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+++ b/programmers/정수 제곱근 판별/solution.java	
@@ -0,0 +1,9 @@
+// [문제 링크]: https://school.programmers.co.kr/learn/courses/30/lessons/12934
+
+class Solution {
+    public long solution(long n) {
+        long answer = 0;
+        long sqn = (long)Math.sqrt(n);
+        return (n%sqn==0&&(sqn!=n&&sqn!=1||n==1))?(long)Math.pow(sqn+1,2):-1;
+    }
+}
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