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Yes Is it only divisible by one and itself? Yes, it is prime. Is it only divisible by one and itself? Yes, it is prime.
The number 3 is a prime number because 1 and 3 is its only factors. A prime number has only two factors, in this case 1 and 3 are the factors. 17,11,7 and 13 are examples of prime numbers.
The only prime factor of 81 is: 3.The prime factors of 225 are: 3 and 5.
2 and 5 are the only prime numbers which differ by 3.
27 has only one prime factor: 3