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Subjects>Math>Basic Math

What are the prime numbers from 1 to 21?

Anonymous

∙ 14y ago

Updated: 4/28/2022

1isn't prime or composite. So 2,3,5,7,11,13,17,19 are all prime because there only factors are 1 and itself.

Wiki User

∙ 14y ago

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Q: What are the prime numbers from 1 to 21?

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What is the prime numbers between 21 and 33?

there are 3 prime numbers in between 21 and 33... they are 23,29, 31.

How many 2 digit prime numbers are there?

There are 21 two-digit prime numbers. The first two-digit prime number is 11, and the last two-digit prime number is 97. Prime numbers are numbers greater than 1 that are only divisible by 1 and themselves.

Are these numbers prime or composite 21?

21 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.

Are prime numbers same as odd numbers?

No.Prime numbers are numbers that can only be divided evenly by itself and 1.For example, the number 7 can only be divided by 7 and 1.Odd numbers are numbers that end in (or are) 1, 3, 5, 7, or 9.For example, the number 21 is odd since it ends in a 1, but it is not prime because itcan be divided by 1, 21, 7, and 3. (7 times 3 = 21.)2 is a prime number and is even not odd - it is the only even prime number.

What are the prime numbers from 21 to 40?

The prime numbers from 21 to 40 are 23, 29, 31, and 37.

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Related Questions

What are all the prime numbers from 1-21?

The prime numbers from 1 to 21 are 2, 3, 5, 7, 11, 13, 17, and 19.

What prime numbers 21?

A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 21 is composite.

Is 21 prime or not prime?

21 = 3x7, and so is not prime, as it can be expressed as the product of multiple prime numbers

What is the prime numbers between 21 and 33?

there are 3 prime numbers in between 21 and 33... they are 23,29, 31.

Is 21 and 67 a pair of prime numbers?

67 is a prime number, but 21 isn't. A prime number can only be evenly divided by '1' and itself. 21 can be evenly divided by 1, 3, 7, and 21.

How many 2 digit prime numbers are there?

There are 21 two-digit prime numbers. The first two-digit prime number is 11, and the last two-digit prime number is 97. Prime numbers are numbers greater than 1 that are only divisible by 1 and themselves.

Are these numbers prime or composite 21?

21 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.

Are 4 and 21 relatively prime?

Yes, 4 and 21 are relatively prime. Numbers that are relatively prime only have the number 1 as a common factor. That is the case with 4 and 21.

Is 21 and 89 a pair of prime numbers?

21 is not prime.

What is the prime numbers of 21?

Do you mean, "What is the prime factorization of 21?"

What is the gcf of 14 21 and 8?

1. These numbers are co-prime

Are prime numbers same as odd numbers?

No.Prime numbers are numbers that can only be divided evenly by itself and 1.For example, the number 7 can only be divided by 7 and 1.Odd numbers are numbers that end in (or are) 1, 3, 5, 7, or 9.For example, the number 21 is odd since it ends in a 1, but it is not prime because itcan be divided by 1, 21, 7, and 3. (7 times 3 = 21.)2 is a prime number and is even not odd - it is the only even prime number.

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