If a is an integer then 4 divides 4a2 so it cannot be a prime.
If a = 0 then 4a2 = 0 and cannot be simplified further
If a = 1 then 4a2 = 4 = 2*2
If a is an integer > 1, then 4a2 = 2*2*a*a
If a is not an integer, then there are too many possible options for the answer.
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9/13 is already as simplified as it is going to get because 13 is prime.
It is already simplified as 107 which is a prime number because it has only two factors which are itself and one
prime numbers can't be simplified because you can't simplify a whole number. i think what you are trying to say is why a prime number doesn't have any factors. a prime number doesn't have any factors because it is only divisible by one and itself.
3 is already simplified. It's a prime number
no because 43 is a prime number and you can not simplify or reduce that number because it is prime so your answer is no.