91 is neither a prime nor a squared number. It is a composite having the prime factors 7 x 13.
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91 squared equals 8,281.
The prime factors of 91 are: 7, 13
91 is the only composite factor of 91. 7 and 13 are prime.
The prime factors of a squared number are the prime factors, if any, of its square root.
97 is the next prime number after 91.