It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 742 254 is not a prime number.
For example, 8 742 254 can be divided by 2: 8 742 254 / 2 = 4 371 127.
For 8 742 254 to be a prime number, it would have been required that 8 742 254 has only two divisors, i.e., itself and 1.
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8 742 254 is an even number, because it is evenly divisible by 2: 8 742 254 / 2 = 4 371 127.
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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 8 742 254 is about 2 956.730.
Thus, the square root of 8 742 254 is not an integer, and therefore 8 742 254 is not a square number.
The square of a number (here 8 742 254) is the result of the product of this number (8 742 254) by itself (i.e., 8 742 254 × 8 742 254); the square of 8 742 254 is sometimes called "raising 8 742 254 to the power 2", or "8 742 254 squared".
The square of 8 742 254 is 76 427 005 000 516 because 8 742 254 × 8 742 254 = 8 742 2542 = 76 427 005 000 516.
As a consequence, 8 742 254 is the square root of 76 427 005 000 516.
The multiples of 8 742 254 are all integers evenly divisible by 8 742 254, that is all numbers such that the remainder of the division by 8 742 254 is zero. There are infinitely many multiples of 8 742 254. The smallest multiples of 8 742 254 are: