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There are 1,000,000,000,000 picometres in one metre. Therefore, one picometre is equal to 1/1000000000000 = 0.000000000001 metres.
Yes, there are quite a few units smaller than the millimetre. A micron is 1/1000th of mm. A nano metre is 1 millionth of a millimetre. A picometre is 1 billionth of a millimetre. See femto and attometre and also angstrom for further things smaller than a metre.
1 metre by 1 metre :P
1 metre
The best unit to use for length is the metre as this is the SI unit. There are a lot of related units that can cover a broad range of lengths, such as the kilometre, metre, centimetre, millimetre, micron, nanometre, angstrom, picometre, femtometre etc.