What is a stock's Div Yield % exactly?

For instance, I am looking at IRE. Div yield % is 81.76% per Google’s stock screener. The market price is .55 and the dividend is .46.
Also, regarding the dividend itself, is that .46 per share? And was that the very last dividend? Where can I see a list of past dividends and is there somewhere I can go to see how different stocks pay their dividends out (i.e. quarterly, annually, etc) ?

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November 11th, 2010 at 5:04 pm
Dividend yield = annual dividend per share / stock market price per share. Usually, annual dividends are calculated as the total dividends in the previous 12 months. Typically, companies declare dividend quarterly. So many Web sites use this formular to calculate the annual dividend: annual dividend = last quarter dividend x 4.
Dividend yield moves in opposite direction to the stock price. As stock price goes down, dividend yield goes up. Dividend yield is also based on past data and is not guaranteed for the future. 81.76% of dividend yield is not sustainable – it means two things – 1. stock price has moved down dramatically since last dividend; 2. investors expect the dividend will be cut or eliminated.
You can look into the news releases to find out the history dividend payments.