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# Which is a prime number 91 51 31 21?

Updated: 12/21/2022

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Q: Which is a prime number 91 51 31 21?
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Related questions

### Which of 21 31 51 and 91 is a prime number?

31 is a prime number.

31

31

### What number is a prime number 91 51 31 21?

31 is the only one that has only two factors: 1 and itself. It is the prime number.

### Which is not a prime number 17 23 31 or 51?

51 is not a prime number: 3x17=51

### Which number is prime out of 91 51 31 21?

21 is divisible by 3 and 7, so it is composite. 91 is divisible by 7 and 13, so it is composite. 51 is divisible by 3 and 17. 31 is divisible by only 1 and itself, so it is the prime number.

### What is a prime number 17 23 31 51?

51 is composite number

### Which number is a prime number a.91 b.51 c.31 d. 21?

91 = 13*751 = 17*321 = 3*731 is prime. &acirc;&ndash;&nbsp;

51 is composite.

### Are 31 and 51 prime numbers?

31 is prime, but 51 is not as 51=3*17.

### Are 40 and 51 relativly prime?

51 is not a prime number. It is divisible by 3.

51 = 3 x 17