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3 is prime, 1 less than the perfect square of 4 (2x2)
It is: 4
It is 64 which is also a square number
A square number, or perfect square, is the square of an integer. 232 is less than 572, 242 is more, so it is not the square of an integer.
A beprisque number nnn is an integer which is either one more than a prime number and one less than a perfect square, or one more than a square and one less than a prime. The 5th such number is 10.
Any number squared except 0 is a perfect square so it follows that prime numbers are less common than perfect squares.
Such a number is called a "perfect square".
It is 25.
8, 10 24, 26
6 and 28 are perfect numbers less than 50.
5040 is not a perfect square. The greatest perfect square less than 5040 is 4900.
Every non-negative real number is a square (every number if in the complex field) so every real number greater than or equal to -1 is one less than a square. Even if you restrict yourself to perfect squares, of the form n2, then n2 - 1 = (n-1)*(n+1) is one less than a square. There are infinitely many such numbers.