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:" Output Enter the number: 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
2
2 is a prime number
11
11 is a prime number
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