Is SQRT an aggregate function?

Answer 1

No. It is a scalar function

SQL aggregate functions return a single value, calculated from values in a column.
for eg: avg,count,first,last,max,min,sum

SQL scalar functions return a single value, based on the input value.
for eg:ucase,lcase,mid,len,round,now,format,sqrt,rand

Answer 2

yeah
its an aggregate function