...
  my $number = "100";
  push @data,
                 [
                     '1234565',
                     "Prototype",
                     '"Number in address is '.$number.'. Please, Please check your records."',
                 ];

##</code><code>##

1234565,Prototype,""Number in address is 100. Please, check your records.""

##</code><code>##

1234565,Prototype,"Number in address is 100. Please, check your records."