It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 2 656 521 is not a prime number.
For example, 2 656 521 can be divided by 3: 2 656 521 / 3 = 885 507.
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For 2 656 521 to be a prime number, it would have been required that 2 656 521 has only two divisors, i.e., itself and 1.
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2 656 521 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 2 656 521 is about 1 629.884.
Thus, the square root of 2 656 521 is not an integer, and therefore 2 656 521 is not a square number.
The square of a number (here 2 656 521) is the result of the product of this number (2 656 521) by itself (i.e., 2 656 521 × 2 656 521); the square of 2 656 521 is sometimes called "raising 2 656 521 to the power 2", or "2 656 521 squared".
The square of 2 656 521 is 7 057 103 823 441 because 2 656 521 × 2 656 521 = 2 656 5212 = 7 057 103 823 441.
As a consequence, 2 656 521 is the square root of 7 057 103 823 441.
The multiples of 2 656 521 are all integers evenly divisible by 2 656 521, that is all numbers such that the remainder of the division by 2 656 521 is zero. There are infinitely many multiples of 2 656 521. The smallest multiples of 2 656 521 are: