![]() ![]() If □ is a natural number, and neither of the prime numbers is less than $$\sqrt\ p_n\ $$ are the first n prime numbers. To be sure of it, we can use the following property. In other words, the only factors of 11 are 1 and itself. Number 11 is a prime number because it doesn’t have proper factors. As we saw, 111 has two proper factors, thus 111 is a composite number. For example, the first prime numbers are 2, 3, 5, and 7.Ī composite number is a natural number that has proper factors. A proper factor of a natural number is a factor that is different from 1 and from the number itself.įor example, 111 = 3×37=1×111 thus, 1, 3, 37, and 111 are all factors of 111, but only 3 and 37 are proper factors of 111.Ī natural number is called a prime number if it is greater than 1, and it doesn’t have proper factors. If you still feel unfamiliar with these notions, we invite you to first read that article and come back here later.Ī factor of a natural number is a positive divisor of the number. We will start recalling some definitions that we have widely discussed in our Prime Numbers article. Get ready to learn more properties about 11! Number 11 is not only the smallest natural number made of a repeated digit, it is also the smallest two-digit prime. In this article, we will be discussing why 11 is a prime number. ![]()
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