Is 1 a prime number? | Why 1 is not a prime number or composite number | Fundamental theorem of arithmetic About video : In this video we have explained why number 1 is neither prime nor composite. Earlier mathematicians used to think that number 1 is prime number but eventually they have to accept that its not, if 1 is prime the fundamental theorem of arithmetic does not stand true. What you will learn : 1 and prime numbers Is 1 a Prime Number what is Fundamental theorem of arithmetic Why isn't 1 Prime? is 1 a composite number truth about number 1 Concepts of number system You Can visit the Zero Math Facebook page on below link : https://www.facebook.com/thezeromath/