[Ruby] A program that determines prime numbers

while str = STDIN.gets
  break if str.chomp == "exit"
n=str.to_i
count=0
for i in 1..n+1 do
    d=n%i
    if d==0 then
        count+=1
    end
end

if count==2 then
    print("true")
else
    print("false")
end
puts "\n"
end

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