A composite is any number that has a prime factor smaller than itself and greater than 1.
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No 5291 is not a prime using 2 numbers. It is a prime using three numbers.
252 2x126 2x2x63 2x2x3x3x7
You can easIly figure this out by using the fact that all even numbers are Divisible by 2. Because 312 is even it to Is also divisible by 2. Because 312 can be divided by mOre than itself and one, which is what a prime number is, it is composiTe.
2.2.3 and
The prime factors of 20 using exponents is: 22x 5