diff --git a/05-isPrime/index.js b/05-isPrime/index.js
index ec9c4ac..dc556a0 100644
--- a/05-isPrime/index.js
+++ b/05-isPrime/index.js
@@ -1,4 +1,17 @@
 export function isPrime(value) {
-  // implementar logica aqui
+  let cont = 0;
+
+  for(let i = 0; i <= value; i++){
+      if (value % i == 0){
+          cont++;
+      }
+  }
+
+  if(cont == 2){
+      return true;
+  }
+  else{
+      return false                
+  }
   
 }
\ No newline at end of file