√1=1, √4=2, √9=3, √16=4, √25=5, √36=6, √49=7, √64=8, √81=9, √100=10, √121=11, √144=12, √169=13, √196=14, √225=15
The square root of a number n is the value that, when multiplied by itself, gives n. For example, √25 = 5 because 5 × 5 = 25. Not all square roots are whole numbers — √2 = 1.41421356… is irrational (it goes on forever with no repeating pattern).
A perfect square is a number whose square root is a whole number: 1, 4, 9, 16, 25, 36...
Can you take the square root of a negative number?
Not in real numbers. The square root of a negative number is an imaginary number (e.g. √−1 = i). However, odd roots of negative numbers are real: ∛−8 = −2.
What is the difference between a square root and a cube root?
A square root asks "what number times itself equals n?" A cube root asks "what number times itself three times equals n?" This calculator handles both and any other root.