According to DietFacts.com, approximately 100. Of course, that's gonna vary with the size of the square.
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It is not possible to give a sensible answer to the question. A square metre is a measure of area in 2-dimensional space whereas the mass of rice depends on the volume - a 3-dimensional measure - of rice. The height of the pile of rice will affect the mass of rice.
the sqare root of rice is grainfart.
There are precisely 5,539 grains of rice in a handful.
There are about 49 grains of rice in a gram.
According to freerice.com, if rice is a staple part of your diet, then you need 18,400 grains of rice.