Is 35 a prime number?
35 is not a prime number. Here is the quickest way to see it.
The answer
No. 35 is not a prime number: 5 × 7 = 35.
How to see that 35 is not prime
35 ends in 5, and every number ending in 5 or 0 is in the 5 times table, so 5 is a factor.
35 has four factors: 1 and 35, plus one pair in between, 5 and 7.
Split 35 into prime factors
35 splits straight into two primes, 5 × 7, so its factor tree has only one branch.
35 in the times tables
35 turns up in 2 different times tables, the 5 and 7: 5 × 7 and 7 × 5.
Quick checks that catch 35
- It ends in 5, so 5 goes in.
35 at a glance
- In words
- thirty-five
- In Roman numerals
- XXXV
- Odd or even
- Odd: it ends in 5
- Its factors add up to
- 48, or 13 without 35 itself, which makes 35 a deficient number
The numbers either side of 35
- 34 is not prime. 34 is even, and every even number can be divided by 2, so 2 is a factor as well as 1 and 34. Check 34 in full
- 36 is not prime. 36 is even, and every even number can be divided by 2, so 2 is a factor as well as 1 and 36. Check 36 in full
Turn the digits round
35 backwards is 53. 53 is prime: 2, 3, 5 and 7 do not go into it, and 11 × 11 is already past 53. Check 53 in full
Related pages
More numbers
Questions parents ask
Which prime numbers are either side of 35?
31 below it and 37 above it, a gap of 6.
What is 35 squared?
35 × 35 = 1225.
What is the smallest number with as many factors as 35?
6. It has 4 factors, the same as 35.
Number facts are the base of 11+ maths
Factors, multiples, primes and square numbers come up all over 11+ maths, from simplifying fractions to ratio. The free diagnostic checks maths, English and both kinds of reasoning, and shows what to practise next. No card is required.