The premise of your questions is false: NOT every number is a Prime number.
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if you mean what three prime numbers add up to a prime number then the answer is : 5 + 7 + 11 = 23
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.
no, because a composite number can be found by multiplying three prime numbers. 3*2*5 = 30, and 30 is a composite number and also has 3 prime factors. Every prime number has 1 prime factor by the way, itself. 1 is neither prime nor composite.
None. 251 is a prime number.