Yes.
1 Nanometer = 1,000 picometers
1 picometer = 0.001 nanometer
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I think you mean decameter and nanometer a decameter is 10 meters a nanometer is one billionth of a meter so a decameter is 10 billion nanometers
A nanometer is 1^10-9 meters, or a meter is 1,000,000,000 times bigger than a nanometer. A googol is 1^100, so a googol of meters is 10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 times bigger or 10^109 times bigger.
A centimeter is equal to 1x10^-2 meters, whereas a nanometer is equal to 1x10^-9 meters. In other words, there are 100 centimeters in a meter and there are 1,000,000,000 (1 billion) nanometers in a meter. Therefor, a nanometer is much smaller than a centimeter.
In the SI system, the micrometer (one thousandth of a millimeter) and nanometer (one thousandth of a micrometer) are used. Outside the SI system, the ångström is also used - it is one tenth of a nanometer, and is useful for measuring atomic distances.
A parsec is a bit larger. Quite a big bit larger. I heard it said that a nanometre is how much an aircraft carrier sinks when a seaguall lands on it. This isnt very much. A parsec is the distance you would cover if you were travelling at 186,000 miles per second for about 3 and a quarter years. These are approximate but you get the idea.