7
if you mean what three prime numbers add up to a prime number then the answer is : 5 + 7 + 11 = 23
3, 5, and 7 are three prime numbers whose average is 5.
There are not three prime numbers that have the sum of 3. The smallest prime number is 2. If all three prime numbers were 2, the sum would 2 + 2 + 2 = 6, so that is the smallest number that is the sum of three prime numbers.
3, 5, and 7 are three prime numbers whose average is 5.
Prime numbers have two factors. Prime squares have three factors. Square numbers have an odd number of factors but that number varies.
181 is a prime number. Prime numbers can't be multiples of three.
No 5291 is not a prime using 2 numbers. It is a prime using three numbers.
The premise of your questions is false: NOT every number is a prime number.
A prime number times a prime number is a composite number. Since prime numbers, except for 2, are odd numbers, a prime number times a prime number is usually an odd number. It will only be an even number if one of the prime numbers is 2. A prime number times a prime number will be a number with four factors unless both prime numbers are the same, in which case it will be a square number with only three factors.
There are no prime numbers with three factors. By definition, a prime number has exactly two factors - 1 and itself.
30 has three prime numbers and is a factor of 60.
None. 251 is a prime number.