The square of an odd number is . (odd/even)

The square of a proper fraction is _____ than the given fraction.(smaller/greater)

$n^2=$ the sum of first $n$ _____ natural numbers.

The number of digits in a perfect square is even.

The square of a prime number is prime.

The sum of two perfect squares is a perfect square.

The difference of two perfect squares is a perfect square.

The product of two perfect squares is a perfect square.

Find the value of the following, using the column method: ${23}^2$