<human>:  check if complex number function.
<bot>: Here is a Python program to check if complex numbers are complex

import numpy as np

def is_complex(x):
  """
    Check if a number is complex
  :param x:
  :return:
  """
  return isinstance(x, complex)

# Enter the number
x = 1 + 1j

# Calling the function
print((is_complex(x)))

#Example Output
# True

#Remember to inspect code for bugs.