def check_substring(string, sample) :
  import re 
   
  if (sample in string): 
      y = "\A" + sample 
      x = re.search(y, string) 
      if x : 
          return ("string starts with the given substring") 
      else : 
          return ("string doesnt start with the given substring") 
  else : 
      return ("entered string isnt a substring")
def is_not_prime(n):
    import math
    
    result = False
    for i in range(2,int(math.sqrt(n)) + 1):
        if n % i == 0:
            result = True
    return result