15 is the square root of 225 (15 x 15 = 225).
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There are no rational numbers between sqrt(-26) and sqrt(-15). The interval comprises purely imaginary numbers.
The square root of 225 is 15, which is NOT an irrational number.
Look for square numbers that are factors of 540, like 36. The square root of 540 = 6 times the square root of 15.
3.872983346207416885179265399782 The 30th digit is 2.