diff --git a/05-isPrime/index.js b/05-isPrime/index.js
index ec9c4ac..18936a8 100644
--- a/05-isPrime/index.js
+++ b/05-isPrime/index.js
@@ -1,4 +1,9 @@
 export function isPrime(value) {
   // implementar logica aqui
-  
+  for (let index = 2; index < value; index++) {
+    if (value % index === 0) {
+      return false
+    }
+  }
+  return value > 1;
 }
\ No newline at end of file