1) Indivisible division figure 
In number theory, the prime factors of a positive integer are the prime numbers that divide that integer exactly. The prime factorization of a positive integer is a list of the integer`s prime factors, together with their multiplicities; the process of determining these factors is called integer factorization. The fundamental theorem of arithmeti....
[n] - the prime factors of a quantity are all of the prime quantities that will exactly divide the given quantity
noun the prime factors of a quantity are all of the prime quantities that will exactly divide the given quantity
Any factor of a number that is a prime number. The fundamental theorem of arithmetic states that every number is either prime or can be expressed as a unique product of primes