1540 = 2 x 2 x 5 x 7 x 11
All of its prime factors are not even in quantity, hence it's not a perfect square number.
PS You could've used a calculator instead.
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1540!! :)
Actually 2x2x5x7x11 is a prime factorization and on multiplying these numbers we get 1540. Prime factorization of a number is the prime numbers which on multiplying together give that number.
No 38 is not a square number.
When you square a real number the answer is positive,
"Still" implies that the original number is a square number. In that case, the answer is as follows: There is no number such that it is a perfect sqiuare and that the number increased (or decreased) by 10 is also a perfect square. And if you do not limit it to perfect square then every non-negative number is a square with the number that is 10 more also being a square.