diff --git a/maths/prime_number.rb b/maths/prime_number.rb
new file mode 100644
index 0000000..28a22f4
--- /dev/null
+++ b/maths/prime_number.rb
@@ -0,0 +1,34 @@
+# A ruby program to check a given number is prime or not
+# Mathematical explanation: A number which has only 2 factors i.e., 1 (one) and itself
+
+# Prime number check function
+def prime_number(number)
+  if number <= 1
+    non_prime_flag = true
+  elsif number == 2
+    non_prime_flag = false
+  elsif number % 2 == 0
+    non_prime_flag = true
+  else
+    non_prime_flag = (2..Math.sqrt(number)).any? { |i| number % i == 0 }
+  end
+
+  if !non_prime_flag
+    puts "The given number #{number} is a Prime."
+  else
+    puts "The given number #{number} is not a Prime."
+  end
+end
+
+# Non-prime input
+prime_number(1)
+
+# prime input
+# Number 2 is an even prime number
+prime_number(2)
+
+# Non-prime input
+prime_number(20)
+
+# Negative input
+prime_number(-21)