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.
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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.