diff --git a/05-isPrime/index.js b/05-isPrime/index.js
index ec9c4ac..4c3b504 100644
--- a/05-isPrime/index.js
+++ b/05-isPrime/index.js
@@ -1,4 +1,5 @@
 export function isPrime(value) {
-  // implementar logica aqui
-  
-}
\ No newline at end of file
+  for (var i = 2; i < value; i++)
+  if (value % i === 0) return false;
+  return value !== 1;
+    }