The reason nobody knows his name is that he was wrong.
The square roots of 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, ... etc. are rational numbers.
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The square root of the prime number 19 is an irrational number
irrational square root of 121 = 11 square root of 1.21 = 1.1 square root of 12.1 = 3.47...
The square root of 13 is irrational. All square roots of whole numbers are irrational unless the number is a perfect square.
The square root of 91 is an irrational number. This can be determined by showing that 91 is not a perfect square, meaning it cannot be expressed as the square of an integer. Since the square root of 91 cannot be simplified to a rational number, it is classified as irrational.
It is irrational.