What times it self equals 15?

Answer 1

The number that, when multiplied by itself, equals 15 is the square root of 15. In mathematical terms, this can be represented as √15 * √15 = 15. The square root of 15 is an irrational number, approximately equal to 3.87298.

Answer 2

The number is close to 3.873

It's an irrational number, so it can't be exactly written with digits.

But 3.873 is within 0.00043 percent of the real number.