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Prime Numbers
A prime number is a number that has exactly two factors: 1 and itself. All whole numbers greater than 1 are either prime numbers or can be written as the product of prime numbers. There are an infinite number of prime numbers, but they occur less frequently among larger numbers. Prime numbers are important in cryptography and number theory.
30,833 Questions
No, 154 is not a prime number.
Any number that ends in 0, 2, 4, 6 or 8 is an even number, and no even number (apart from 2) is prime.
Factors of 154 include 2 x 77, 11 x 14 and 7 x 22.
What are the prime numbers between 43 and 200?
The numbers 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197 and 199 are prime (including the boundaries).
Why can there not be a prime number that is also a square number?
Square numbers, greater than 1, have more than two factors.
1-100 prime and compositeshow the numbers to 1-100?
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 are the prime numbers in that range. Other than one (which is neither) the rest are composite.
What is 120 is it a prime or composite number?
120 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.
Find the greatest common factor using prime factorization of 69and207?
It's not necessary. Since 69 is a factor of 207, it is automatically the GCF. But if you insist...
69
3,23
207
3,69
3,3,23
Select the common factors.
3 x 23 = 69, the GCF.
Factorise 693 by making use of prime factors only?
factorise 693 by making use of prime factors only
The prime factors of 693 are
3, 7, 11
3*3 = 9
7*9 =63
11*63 = 693
See http://en.wikipedia.org/wiki/Sieve_of_Eratosthenes
What is a prime factor of 27 1 3 9 54?
3 because it is the only prime in the list. (1 doesn't count as a prime)
Do you mean, what are the common factors of 49, 21, and 91? Only 7 (and 1, of course) is a common factor for those numbers. Individually, 49's factors are 1, 7 and itself. 21's factors are 1, 3, 7, and itself. 91's factors are 1, 7, 13, and itself.
What is the product of the prime factor 28?
I think you misworded your question. I am not exactly sure what you are looking for. If you want to know the prime factorization of the number 28, it is, 2^2 * 7. That is two squared times seven.
