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Try it and see. Better yet guess first: what do you think i%j will yield if j is 1? And how will that affect the numbers you report as prime.

Personally I don't regard 1 as prime, but if you...

if(i == j){
output.println(" "+i);}
}


We can be quite sure that won't print a "1" because j has just gone through a for loop where it was set to 2 and made to increment.

Prime number -...

If you want someone to suggest why the code you're using doesn't output 1, then you'll have to post the code you're using...

Also note that 1 isn't a prime number.