Question

how do you now if 94 is a prime number

Answer 1

94 is not a prime number. Because you have a "4" at the end of 94 that means that it is divisible by 2. 2 x 47 is 94. Because it has factors more than one and itself, it has to be a composite number

Answer 2

Prime numbers only have 2 factors. If it has more than 2 factors it is not a prime number.