The square root of 121 is 11, since 11 multiplied by itself equals 121. Since 11 can be expressed as a fraction (11/1), it is classified as a rational number.
Rational numbers are defined as numbers that can be expressed as the quotient or fraction of two integers, where the denominator is not zero. As shown, 11 fulfills this criterion, confirming that the square root of 121 is indeed a rational number.