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To print all the prime factors for n numbers, program a simple algorithm:

1. While n is divisible by 2, print 2 and divide n by 2. 

2. Now, n is odd. Start a loop from i = 3 to the square root of n. While i divides n, print i, divide n by i, increment i by 2 and continue.

3. If n is a prime number and if it greater than 2, then n is not 1 from the above step. Print n if it is greater than 2.

Yes, you will get a certificate of completion for Prime Number in Java after completing all the modules and cracking the assessment. The assessment tests your knowledge of the subject and badges your skills.

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Great Learning Academy provides this Prime Number in Java course for free online. The course is self-paced and helps you understand various topics that fall under the subject with solved problems and demonstrated examples. The course is carefully designed, keeping in mind to cater to both beginners and professionals, and is delivered by subject experts. Great Learning is a global ed-tech platform dedicated to developing competent professionals. Great Learning Academy is an initiative by Great Learning that offers in-demand free online courses to help people advance in their jobs. More than 5 million learners from 140 countries have benefited from Great Learning Academy's free online courses with certificates. It is a one-stop place for all of a learner's goals.

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