# Pastebin 0Dsdrdek
Error in ./test.cr:21: instantiating 'is_prime(Int32)'                                                                                                         
                                                                                                                                                               
        if num % i == 0 && is_prime(i)                                                                                                                         
                           ^~~~~~~~                                                                                                                            
                                                                                                                                                               
in ./test.cr:8: undefined method 'sqrt' for Float64                                                                                                            
                                                                                                                                                               
        (2..Math.sqrt(x).sqrt.ceil + 1).each do |i|                                                                                                            
                  ^~~~                                                                                                                                         
                                                                                                                                                               
================================================================================                                                                               
                                                                                                                                                               
Float64 trace:                                                                                                                                                 
                                                                                                                                                               
  macro macro_38000416 (in /opt/crystal/src/math/math.cr:11):274                                                                                               
                                                                                                                                                               
        def sqrt(value)                                                                                                                                        
            ^~~~                                                                                                                                               
                                                                                                                                                               
  macro macro_38000416 (in /opt/crystal/src/math/math.cr:11):275                                                                                               
                                                                                                                                                               
          sqrt(value.to_f)                                                                                                                                     
          ^~~~                                                                                                                                                 
                                                                                                                                                               
  macro macro_38000416 (in /opt/crystal/src/math/math.cr:11):270                                                                                               
                                                                                                                                                               
        def sqrt(value : Float64)                                                                                                                              
            ^~~~