your answer is 1. prime numbers are whole numbers that are only divisible by itself and 1., which generally means they have only 2 factors,. number 1 has only 1 factor which is itself,1 so it's not a prime number. composite numbers have more than 2 factors and number 1 only has one factor as i told above so, 1 isn't a composite number. 1 is a factor of 144 because 1×144=144
