diff --git a/05-isPrime/index.js b/05-isPrime/index.js
index ec9c4ac..e51ad63 100644
--- a/05-isPrime/index.js
+++ b/05-isPrime/index.js
@@ -1,4 +1,10 @@
 export function isPrime(value) {
   // implementar logica aqui
-  
+  if (value === 1) {
+    return false
+  }
+  for (let p = 2; p < value; p++)
+    if (value % p === 0) {
+      return false
+    } return true
 }
\ No newline at end of file