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ANSWER: 61 is a prime number but 51 is a composite number.

61 is a Prime number because the factors of 61 are 1 and itself (61).

51 is a composite number because the factors of 51 other 1 and itself (51) are 3 and 17.

Q: Is 61 and 51 a prime number?

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51 is a composite number but 61 is a prime number

51 = 3x17

33 = 3 x 11 51 = 3 x 17 41 prime 61 prime

51 is composite. 51 = 3 x 17. The other three numbers are prime numbers.

3 x 17 = 51. It has factors other than 1 and itself. It is composite. 61 is prime. Its only factors are 1 and 61. 71 is prime. Its only factors are 1 and 71. 7 x 13 = 91. It is a composite number.

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51 is a composite number but 61 is a prime number

61 is a prime number. 49 is not a prime number as it is divisible by 7. 51 is not a prime number as it is divisible by 3.

51 = 3x17

51 composite, 61 prime.

37 = prime 47 = prime 51 = 17 x3 61 = prime

33 = 3 x 11 51 = 3 x 17 41 prime 61 prime

Since 61 is already prime, a factor tree is not necessary. The prime factorization of 51 is 3 x 17, which wouldn't make much of a tree. More like a factor shrub.

They are: 53, 59, 61, 67, 71 and 73

51 is composite. 51 = 3 x 17. The other three numbers are prime numbers.

3 x 17 = 51. It has factors other than 1 and itself. It is composite. 61 is prime. Its only factors are 1 and 61. 71 is prime. Its only factors are 1 and 71. 7 x 13 = 91. It is a composite number.

17 and 61

61 is a prime number.