input: Write a python function to check if a number is prime using a class.
  assert PrimeChecker(7).is_prime() == True
  assert PrimeChecker(10).is_prime() == False
  assert PrimeChecker(13).is_prime() == True
output: class PrimeChecker:
      def __init__(self, number):
          self.number = number
  
      def is_prime(self):
          if self.number <= 1:
              return False
          for i in range(2, int(self.number ** 0.5) + 1):
              if self.number % i == 0:
                  return False
          return True