input: Write a python function to check if there is any pair of numbers in a list whose product is even.
  assert has_even_product([1, 3, 5, 7])==False
  assert has_even_product([2, 4, 6])==True
  assert has_even_product([1, 2, 3])==True
output: def has_even_product(lst):
      for i in range(len(lst)):
          for j in range(i + 1, len(lst)):
              if (lst[i] * lst[j]) % 2 == 0:
                  return True
      return False