diff --git a/src/index.js b/src/index.js
index 4c197d6..35f04b4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,5 +1,15 @@
 const trialDivision = (number) => {
-    
+  if (!Number.isInteger(number) || number <= 1) {
+    return false;
   }
 
-  module.exports = trialDivision;
\ No newline at end of file
+  for (i = 2; i < number; i++) {
+    if(number % i == 0) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+module.exports = trialDivision;
\ No newline at end of file