Have you tried using placeholders ?

my $sql = 'SELECT COUNT(le_id)
           FROM legal_entity 
           WHERE le_corid = ? 
             AND le_lesid = ?
             AND le_inc_name = ?';

my $sth = $dbh->prepare($sql);
$sth->execute(586,$lesid,$incname);
my ($count_le) = $sth->fetchrow_array;
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