diff --git a/05-isPrime/index.js b/05-isPrime/index.js
index ec9c4ac..9824c23 100644
--- a/05-isPrime/index.js
+++ b/05-isPrime/index.js
@@ -1,4 +1,8 @@
 export function isPrime(value) {
   // implementar logica aqui
-  
+  for(let i=2;i <= Math.sqrt(value);i++){
+    if(value % i == 0 || value < 2)
+      return false;
+    }
+  return true
 }
\ No newline at end of file