diff --git a/functions/isprime.js b/functions/isprime.js
new file mode 100644
index 0000000..26e1887
--- /dev/null
+++ b/functions/isprime.js
@@ -0,0 +1,27 @@
+module.exports = {
+  handler: (event, context) => {
+    console.log(event);
+    num=event.data;
+    if (num == 1) return "Not Prime";
+  num += 2;
+
+  var upper = Math.sqrt(num);
+  var sieve = new Array(num)
+    .join(',').split(',') // get values for map to work
+    .map(function(){ return true });
+  
+  for (var i = 2; i <= num; i++) {
+    if (sieve[i]) {
+      for (var j = i * i; j < num; j += i) {
+        sieve[j] = false;
+      };
+    };
+  };
+if (sieve[num-2]) {
+  return "Prime";
+  };
+  else {
+  return "Not Prime";
+};
+  },
+};