uses crt; Var i,n: integer; Begin Clrscr; Write ('Nhap so can kiem tra n: '); readln(n); If (n=0) or (n=1) then Writeln(n,' Khong phai la so nguyen to') Else Begin i:=1; Repeat i:= i+1; Until (n mod i= 0) or (i*i>n); If i*i>n then Writeln (n,' la so nguyen to') Else Writeln (n,' khong phai la so nguyen to'); End; Readln; End.
