PRIME FACTORS OF 81
The only prime factor of 81 is 3.
Factor trees can be used to identify the prime factors of a number. The diagram below shows the factor tree of 81.
Prime factors are the numbers at the endpoints. For 81, the only factor is 3.
The prime factorization of 81 is 34.
81 is a composite number.
A prime factor is a factor that is prime. Prime factors can be identified by checking the endpoints of a factor tree.