Question

What is the greatest perfect square that is a factor of 7?

Answer 1

The only integer factors of `7` are `+-1` and `+-7`. Of these the only one that is a perfect square is `1`.

Explanation:

`7` is prime, so it's only factors are `+-1` and `+-7`.

Of these, the only number that is a perfect square is `1 = 1^2`