Python Program:

Example:

def binary(num) :
  while(num!=0):
    if(num%10==0 or num%10==1):
        num=int(num/10)
    else : return 0
  return 1

num=int(input("Enter Your Number :"))
if binary(num):
    print("Number is in binary form")
else :
    print("Number is not in binary form")

Output:

  Enter Your number : 1101
  Number is in binary form

Binary Numbers : Numbers with only 0 & 1 combination

Examples like: 101, 111, 10, 11111

Main Logic :

def binary(num) :
  while(num!=0):
    if(num%10==0 or num%10==1):
        num=int(num/10)
    else : return 0
  return 1

Divide the number by 10 while your number becomes 0[ZERO] &
In-between check, is there any remainder other than 0 & 1