It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 263 201 138 is not a prime number.
For example, 263 201 138 can be divided by 2: 263 201 138 / 2 = 131 600 569.
For 263 201 138 to be a prime number, it would have been required that 263 201 138 has only two divisors, i.e., itself and 1.
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263 201 138 is an even number, because it is evenly divisible by 2: 263 201 138 / 2 = 131 600 569.
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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 263 201 138 is about 16 223.475.
Thus, the square root of 263 201 138 is not an integer, and therefore 263 201 138 is not a square number.
The square of a number (here 263 201 138) is the result of the product of this number (263 201 138) by itself (i.e., 263 201 138 × 263 201 138); the square of 263 201 138 is sometimes called "raising 263 201 138 to the power 2", or "263 201 138 squared".
The square of 263 201 138 is 69 274 839 044 495 040 because 263 201 138 × 263 201 138 = 263 201 1382 = 69 274 839 044 495 040.
As a consequence, 263 201 138 is the square root of 69 274 839 044 495 040.
263 201 138 is a number with 9 digits.
The multiples of 263 201 138 are all integers evenly divisible by 263 201 138, that is all numbers such that the remainder of the division by 263 201 138 is zero. There are infinitely many multiples of 263 201 138. The smallest multiples of 263 201 138 are: