Ruby program to check whether the given number is prime or not

Checking prime number

What is Prime number?

Prime numbers are those numbers which can only be divisible by itself or 1

puts "Enter the number:"
num=gets.chomp.to_i
count=0
if (num==0)
   puts "0 is not prime"
else

   i=2
   while(i<num)
       if (num%i==0)
           count+=1
       end
       i+=1
   end

end
   if count>1
       puts "#{num} is not a prime number"
   else
       puts "#{num} is a prime number"
   end

Output

Enter the number:
2
2 is a prime number

Enter the number:
11
11 is a prime number