It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 900 002 642 is not a prime number.
For example, 900 002 642 can be divided by 2: 900 002 642 / 2 = 450 001 321.
For 900 002 642 to be a prime number, it would have been required that 900 002 642 has only two divisors, i.e., itself and 1.
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900 002 642 is an even number, because it is evenly divisible by 2: 900 002 642 / 2 = 450 001 321.
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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 900 002 642 is about 30 000.044.
Thus, the square root of 900 002 642 is not an integer, and therefore 900 002 642 is not a square number.
The square of a number (here 900 002 642) is the result of the product of this number (900 002 642) by itself (i.e., 900 002 642 × 900 002 642); the square of 900 002 642 is sometimes called "raising 900 002 642 to the power 2", or "900 002 642 squared".
The square of 900 002 642 is 810 004 755 606 980 224 because 900 002 642 × 900 002 642 = 900 002 6422 = 810 004 755 606 980 224.
As a consequence, 900 002 642 is the square root of 810 004 755 606 980 224.
900 002 642 is a number with 9 digits.
The multiples of 900 002 642 are all integers evenly divisible by 900 002 642, that is all numbers such that the remainder of the division by 900 002 642 is zero. There are infinitely many multiples of 900 002 642. The smallest multiples of 900 002 642 are: