A [[natural number]] is considered ''' ''k''-almost prime''' if it has exactly ''k'' prime factors. 1-almost prime numbers are [[prime numbers|primes]]. 2-almost prime numbers are [[semiprime]]. | A [[natural number]] is considered ''' ''k''-almost prime''' if it has exactly ''k'' prime factors. 1-almost prime numbers are [[prime numbers|primes]]. 2-almost prime numbers are [[semiprime]]. |