input: Write a function to determine if a given number is prime. The function should prompt the user to input a number and then check if the number is prime. If the number is prime, return "True", otherwise return "False".
  assert is_prime(17) == True
  assert is_prime(20) == False
  assert is_prime(2) == True
  assert is_prime(1) == False
  assert is_prime(0) == False
output: def is_prime(n):
      if n <= 1:
          return "False"
      for i in range(2, int(n**0.5) + 1):
          if n % i == 0:
              return "False"
      return "True"