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Do all numbers have at least one prime factor?
All whole numbers except for -1, 0 and 1 have at least one prime factor.
Are there any pairs of prime numbers that when multiplied do not make their least common multiple?
The product of all pairs of prime numbers is always the least common multiple of the two prime numbers.
Do all composite numbers have at least one prime number?
Yes.
Is 25 an odd prime number?
'25' is odd, all right, but not prime. (It can be divided by 1, 5, and 25) By the way, prime numbers must be odd numbers. All even numbers can be divided by 2, at least, and are therefore not prime.
What is the least common denominator of 2 3 and 7?
The numbers 7, 3, and 2 share no common denominator. They are prime numbers.
What is the least common multiple of two different prime numbers?
The least common multiple of two different prime numbers is the product of those two prime numbers.
All the prime numbers in order of least to greatest what are they?
That's an infinite list.
What numbers under 100 have at least a 2 or 5 in their prime factorization?
All the even numbers and all the odd multiples of 5.
Why are prime numbers divisible?
Prime numbers are divisible because any numbers that are divisible are prime. If a number isn't divisible, it isn't prime. Prime numbers have to be divisible by at least one pair of numbers to be prime.
Do all even numbers have at least two prime factors?
Not two DISTINCT prime factors, no. For example, 64 = 2^6 only has prime factor 2. All even numbers which are not a power of 2 must have at least two distinct prime factors, however; one of them will, of course, be 2.
What two numbers have the same product as their least common multiple?
Prime numbers or relatively prime numbers.
What is the least number that is divisible by four different prime numbers?
the least number is 210 which is divisible by four different prime numbers.
