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diff --git a/challenge-159/robert-dicicco/ruby/ch-2.rb b/challenge-159/robert-dicicco/ruby/ch-2.rb
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+#!ruby.exe
+
+require 'prime'
+
+# AUTHOR: Robert DiCicco
+# DATE: 6-APR-2022
+# Challenge 159 Moebius Number ( Ruby )
+
+def prime_factorization(n)
+  Prime.prime_division(n).flat_map { |factor, power| [factor] * power }
+end
+
+def checkSquareFree(n)
+  Prime.prime_division(n).each do |i|
+    if i[1] > 1
+      return 0
+    end
+  end
+
+  return 1
+end
+
+def getPrimeFactorCount(n)
+  a = prime_factorization(n)
+  x = a.size % 2
+
+  if x == 0
+    return 1
+  else
+    return 0
+ end
+end
+
+def showResults(pf,sf)
+  if ((pf == 1) && (sf == 1))
+    print("Output: 1\n")
+  elsif ((pf == 0) && (sf == 1))
+    print("Output: -1\n")
+  elsif ( sf == 0 )
+    print("Output: 0\n")
+  else
+    print("Error!!!\n")
+  end
+end
+
+n = ARGV[0].to_i
+
+print("Input: #{n}\n")
+
+sf = checkSquareFree(n)
+pf = getPrimeFactorCount(n)
+
+showResults(pf,sf)