While loop with if statement is not working

I want the while loop to run as long as the name is not "1234". And if the name is only spaces, I want to print "name can not be only spaces" and ask for a name again. Else I want it to just ask for a name again.

name=input("")


while (name!="1234"):
  if(name.isspace):
    print ("name can not be only spaces")
    name=input("")
  else:
    name=input("")

The problem I have is that it prints "name can not only be spaces" for whatever string I give it. Even if the string does not have spaces it prints the if statement. What is going on?