You can use position numbers in GROUP BY or ORDER BY clauses. Not in aggregate function calls.
Test code
data test;
set sashelp.class ;
if _n_ in (1,3) then call missing(age);
if _n_ in (2,3,4) then call missing(height);
run;
proc sql;
select
count(*) as count_star
, count(1) as count_1
, count(1000) as count_1000
, count(.) as count_missing
, count(' ') as count_blank
, count(name) as count_name
, count(age) as count_age
, count(height) as count_height
from test
;
quit;
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