It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 2 721 097 is not a prime number.
For example, 2 721 097 can be divided by 1 319: 2 721 097 / 1319 = 2 063.
For 2 721 097 to be a prime number, it would have been required that 2 721 097 has only two divisors, i.e., itself and 1.
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2 721 097 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 2 721 097 is about 1 649.575.
Thus, the square root of 2 721 097 is not an integer, and therefore 2 721 097 is not a square number.
The square of a number (here 2 721 097) is the result of the product of this number (2 721 097) by itself (i.e., 2 721 097 × 2 721 097); the square of 2 721 097 is sometimes called "raising 2 721 097 to the power 2", or "2 721 097 squared".
The square of 2 721 097 is 7 404 368 883 409 because 2 721 097 × 2 721 097 = 2 721 0972 = 7 404 368 883 409.
As a consequence, 2 721 097 is the square root of 7 404 368 883 409.
The multiples of 2 721 097 are all integers evenly divisible by 2 721 097, that is all numbers such that the remainder of the division by 2 721 097 is zero. There are infinitely many multiples of 2 721 097. The smallest multiples of 2 721 097 are: