Yes.
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Yes - 7056 is equal to 84 squared.
There are 7056 4-digit numbers with at most one of {0,2,4,6,8}, and any number of {1,3,5,7,9}. Leading 0s are not permitted.There are 7056 4-digit numbers with at most one of {0,2,4,6,8}, and any number of {1,3,5,7,9}. Leading 0s are not permitted.There are 7056 4-digit numbers with at most one of {0,2,4,6,8}, and any number of {1,3,5,7,9}. Leading 0s are not permitted.There are 7056 4-digit numbers with at most one of {0,2,4,6,8}, and any number of {1,3,5,7,9}. Leading 0s are not permitted.
As much as, in these days of uncertainty, anything can be anything. As long as the constraints of a rational number are kept to, a rational number will always remain a rational number.
Yes.
Yes, but only if the rational number is 0.