# An easier prime number question

**Question**

What is the least 3 digit number that is the square of a prime number?

a. 100

b. 109

c. 121

d. 125

e. 144

**Answer**

From the available answer choices (a – e) above, consider:

100 = 10^2 = not a square of a prime number

109 = not a square

121 = 11^2 = a square of a prime number

125 = 5^3 = not a square

144 = 12^2 = not a square of a prime number

Hence answer is 11 since its the only square of a prime number in the list above. If you had more than one “square of prime number”, then you would have to choose the smallest so that we get the “least”.