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Because the 5th number which is 5 is the square root of 25.
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.
A perfect square is a rational number equal to the square of a whole number.
The square root is the number which is times by itself, to get the square number.
No it is not a square number but it is very close to the square number 121.