It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 020 577 is not a prime number.
For example, 1 020 577 can be divided by 449: 1 020 577 / 449 = 2 273.
For 1 020 577 to be a prime number, it would have been required that 1 020 577 has only two divisors, i.e., itself and 1.
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1 020 577 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 1 020 577 is about 1 010.236.
Thus, the square root of 1 020 577 is not an integer, and therefore 1 020 577 is not a square number.
The square of a number (here 1 020 577) is the result of the product of this number (1 020 577) by itself (i.e., 1 020 577 × 1 020 577); the square of 1 020 577 is sometimes called "raising 1 020 577 to the power 2", or "1 020 577 squared".
The square of 1 020 577 is 1 041 577 412 929 because 1 020 577 × 1 020 577 = 1 020 5772 = 1 041 577 412 929.
As a consequence, 1 020 577 is the square root of 1 041 577 412 929.
The multiples of 1 020 577 are all integers evenly divisible by 1 020 577, that is all numbers such that the remainder of the division by 1 020 577 is zero. There are infinitely many multiples of 1 020 577. The smallest multiples of 1 020 577 are: