diff --git a/05-isPrime/index.js b/05-isPrime/index.js
index ec9c4ac..397ac79 100644
--- a/05-isPrime/index.js
+++ b/05-isPrime/index.js
@@ -1,4 +1,12 @@
 export function isPrime(value) {
   // implementar logica aqui
-  
-}
\ No newline at end of file
+  if (!value) return 0;
+
+  for(let i = 2; i < value; i++){
+    if(value % i === 0){
+      return false
+    }
+  }
+
+  return true
+}