diff --git a/05-isPrime/index.js b/05-isPrime/index.js
index ec9c4ac..740d231 100644
--- a/05-isPrime/index.js
+++ b/05-isPrime/index.js
@@ -1,4 +1,8 @@
 export function isPrime(value) {
   // implementar logica aqui
-  
-}
\ No newline at end of file
+  for (let i = 2; i < value; i++)
+    if (value % i === 0) {
+      return false;
+    }
+  return value > 1;
+}