diff --git a/05-isPrime/index.js b/05-isPrime/index.js
index ec9c4ac..0c09d66 100644
--- a/05-isPrime/index.js
+++ b/05-isPrime/index.js
@@ -1,4 +1,9 @@
 export function isPrime(value) {
-  // implementar logica aqui
-  
+// implementar logica aqui
+  for (let i = 2; i < value; i++) { 
+    if (value % i === 0) {
+      return false;
+    }
+  }
+  return value > 1;
 }
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