It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 261 016 242 is not a prime number.
For example, 261 016 242 can be divided by 2: 261 016 242 / 2 = 130 508 121.
For 261 016 242 to be a prime number, it would have been required that 261 016 242 has only two divisors, i.e., itself and 1.
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261 016 242 is an even number, because it is evenly divisible by 2: 261 016 242 / 2 = 130 508 121.
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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 261 016 242 is about 16 155.997.
Thus, the square root of 261 016 242 is not an integer, and therefore 261 016 242 is not a square number.
The square of a number (here 261 016 242) is the result of the product of this number (261 016 242) by itself (i.e., 261 016 242 × 261 016 242); the square of 261 016 242 is sometimes called "raising 261 016 242 to the power 2", or "261 016 242 squared".
The square of 261 016 242 is 68 129 478 587 802 560 because 261 016 242 × 261 016 242 = 261 016 2422 = 68 129 478 587 802 560.
As a consequence, 261 016 242 is the square root of 68 129 478 587 802 560.
261 016 242 is a number with 9 digits.
The multiples of 261 016 242 are all integers evenly divisible by 261 016 242, that is all numbers such that the remainder of the division by 261 016 242 is zero. There are infinitely many multiples of 261 016 242. The smallest multiples of 261 016 242 are: