# Calculate the integer square root of a number online (integer square root calculator)

The ir2 command outputs the integer square root of a given number. If you input ir2 7 in the form above, the calculator shows 2 like this.

The number you input is in green and the output (2) is in red. You can input several numbers in the form. All values should be separated by a space.

The integer square root of 15 and 16 is 3 and 4 respectively. Because the square root of 16 is 4, the integer square root of 16 is also 4. The square root of 15 is 3.872... so the integer square root of 15 is 3. The integer square root is the floor of the square root.