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Yes, a perfect square is a number that has an integer square root.
The smallest 5-digit integer perfect square is 10,000 = (100)2The largest 5-digit integer perfect square is 99,856 = (316)2So we want to know how many numbers that is, from 100 to 316 inclusive.It's 316 minus the first 99 = 217 of them.
Any integer is a perfect square oot (of its square). So 300 is a perfect square root of 90000.
Since no integer multiplied by itself can yield 111, it is not a perfect square. 121, however, is a perfect square. Its square root is 11.
The square root of every perfect square is an integer. However, there are also square roots of numbers that are not perfect squares.