It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 742 780 518 is not a prime number.
For example, 742 780 518 can be divided by 2: 742 780 518 / 2 = 371 390 259.
For 742 780 518 to be a prime number, it would have been required that 742 780 518 has only two divisors, i.e., itself and 1.
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742 780 518 is an even number, because it is evenly divisible by 2: 742 780 518 / 2 = 371 390 259.
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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 742 780 518 is about 27 254.000.
Thus, the square root of 742 780 518 is not an integer, and therefore 742 780 518 is not a square number.
The square of a number (here 742 780 518) is the result of the product of this number (742 780 518) by itself (i.e., 742 780 518 × 742 780 518); the square of 742 780 518 is sometimes called "raising 742 780 518 to the power 2", or "742 780 518 squared".
The square of 742 780 518 is 551 722 897 920 348 352 because 742 780 518 × 742 780 518 = 742 780 5182 = 551 722 897 920 348 352.
As a consequence, 742 780 518 is the square root of 551 722 897 920 348 352.
742 780 518 is a number with 9 digits.
The multiples of 742 780 518 are all integers evenly divisible by 742 780 518, that is all numbers such that the remainder of the division by 742 780 518 is zero. There are infinitely many multiples of 742 780 518. The smallest multiples of 742 780 518 are: