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55000 or 55,000. Sometimes, the comma separator (for thousands) is replaced by a full stop, or a space.
None. A kilometre is a measure of length or distance in 1-dimensional space while a square mile is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.
It is two hundred fifty six quartic metres. Are you sure of this, though? It is a measure of volume in four-dimensional hyperspace. Since you asked this question, it is unlikely that you mathematically advanced to a level where 4-dimensional space is something you come across routinely.
The Prophet, peace be upon him said: {In the Paradise are hundred grades, the space between each two grades is as wide as the space between heaven and earth. The Paradise has eight doors and hundred grades.
The atmosphere varies but is from 100 miles to 120 miles thick.