It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 2 742 336 is not a prime number.
For example, 2 742 336 can be divided by 2: 2 742 336 / 2 = 1 371 168.
For 2 742 336 to be a prime number, it would have been required that 2 742 336 has only two divisors, i.e., itself and 1.
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2 742 336 is an even number, because it is evenly divisible by 2: 2 742 336 / 2 = 1 371 168.
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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 2 742 336 is 1 656.
Therefore, the square root of 2 742 336 is an integer, and as a consequence 2 742 336 is a perfect square.
The square of a number (here 2 742 336) is the result of the product of this number (2 742 336) by itself (i.e., 2 742 336 × 2 742 336); the square of 2 742 336 is sometimes called "raising 2 742 336 to the power 2", or "2 742 336 squared".
The square of 2 742 336 is 7 520 406 736 896 because 2 742 336 × 2 742 336 = 2 742 3362 = 7 520 406 736 896.
As a consequence, 2 742 336 is the square root of 7 520 406 736 896.
The multiples of 2 742 336 are all integers evenly divisible by 2 742 336, that is all numbers such that the remainder of the division by 2 742 336 is zero. There are infinitely many multiples of 2 742 336. The smallest multiples of 2 742 336 are: