It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 742 118 is not a prime number.
For example, 6 742 118 can be divided by 2: 6 742 118 / 2 = 3 371 059.
For 6 742 118 to be a prime number, it would have been required that 6 742 118 has only two divisors, i.e., itself and 1.
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6 742 118 is an even number, because it is evenly divisible by 2: 6 742 118 / 2 = 3 371 059.
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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 6 742 118 is about 2 596.559.
Thus, the square root of 6 742 118 is not an integer, and therefore 6 742 118 is not a square number.
The square of a number (here 6 742 118) is the result of the product of this number (6 742 118) by itself (i.e., 6 742 118 × 6 742 118); the square of 6 742 118 is sometimes called "raising 6 742 118 to the power 2", or "6 742 118 squared".
The square of 6 742 118 is 45 456 155 125 924 because 6 742 118 × 6 742 118 = 6 742 1182 = 45 456 155 125 924.
As a consequence, 6 742 118 is the square root of 45 456 155 125 924.
The multiples of 6 742 118 are all integers evenly divisible by 6 742 118, that is all numbers such that the remainder of the division by 6 742 118 is zero. There are infinitely many multiples of 6 742 118. The smallest multiples of 6 742 118 are: