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121 is an odd number and it is also a square number because 11*11 = 121
121
1, 11, and 121. (This number has an odd number of factors because it is a perfect square: 11 * 11 = 121.)
121 is a composite number, having the three factors 1, 11, and 121. A prime number has only two factors, 1 and itself.
The square of any prime number has only three factors. Example: 121 is the square of 11, a prime number. The only factors of 121 are 1, 11, and 121 itself.