diff --git a/challenges/6-numeros-primos/crystal/pantotone/main-v2.cr b/challenges/6-numeros-primos/crystal/pantotone/main-v2.cr
new file mode 100644
index 00000000..4bbb1196
--- /dev/null
+++ b/challenges/6-numeros-primos/crystal/pantotone/main-v2.cr
@@ -0,0 +1,16 @@
+number : Int32 = ARGV[0].to_i
+
+def isPrime(number : Int32) 
+    return false if number < 2
+    return true if number == 2
+
+    divisor : Int32 = 1
+    unless divisor > Math.isqrt(number) 
+        divisor += 1
+        return false if number % divisor == 0
+    end
+
+    return true
+end
+
+puts isPrime(number)
\ No newline at end of file