diff --git a/05-isPrime/index.js b/05-isPrime/index.js
index ec9c4ac..51810f8 100644
--- a/05-isPrime/index.js
+++ b/05-isPrime/index.js
@@ -1,4 +1,10 @@
 export function isPrime(value) {
   // implementar logica aqui
-  
+  if (value < 2) return false
+      for (let i = 2; i < value; i++) {
+        if (value % i == 0){
+          return false 
+        } 
+      } 
+      return true
 }
\ No newline at end of file